Roof top cargo boxes turn a cramped SUV or sedan into a genuine road-trip machine, but the category splits sharply between premium hard shells from Thule and Yakima and budget boxes that cost far less while cutting corners on hardware and aerodynamics. The Thule Motion 3 earns my best overall pick for its refined drag-reducing shape, secure locking and effortless dual-side access, while the Yakima SkyBox NX 18 is the strongest alternative if you want comparable capacity with a slightly different mounting system. Budget shoppers get real value from options like the TUFFIOM 13.4 cu ft and GarveeTech 12 cu ft boxes, though you trade away smooth latches and long-term durability. Soft bags like the WORKPRO and FIVKLEMNZ carriers suit occasional users who want storage without the permanence of a hard shell. Read on for the full breakdown, including which boxes fit which vehicles and where the cheap ones fall short.
Get travel and outdoor gear delivered free — and shop member deals
- Fast, free delivery on millions of items
- Access to Prime Big Deal Days deals on October 6–7
- Prime Video, Amazon Music and more included
Complete the kit
Key Takeaways
- Thule‘s lineup (Motion 3, Force 3 XL, Pulse 2) dominated the top of this comparison because of tool-free mounting, dual-side access and drag-reduced shells — the gap between them and budget boxes is mostly in hardware refinement, not raw capacity.
- The 11-14 cu ft tier (DNA Motoring, GarveeTech, PM PERFORMOTOR) is where budget buyers get the most storage per dollar, but every one of them uses cheaper locks and noisier profiles than the Thule Pulse 2 M at the same size.
- Rear-opening boxes like the SportRack Vista XL are the only realistic choice for tall vehicles and short drivers, but they force you to reach past your cargo, which dual-side models eliminate entirely.
- Soft rooftop bags (WORKPRO, FIVKLEMNZ, MIDABAO) matched hard shells on weatherproofing when paired with a roof rack, but none offer security or crash protection — they are storage, not lockable vaults.
- Capacity claims varied widely in usefulness: a 21 cu ft bag on a naked roof sags and flaps, while a 16 cu ft rigid box with internal tie-downs holds gear more securely — buy for your rack, not the biggest number.
| Hard-Shell Rooftop Cargo Carrier |  | Best Budget Hard-Shell Starter | Material: ABS plastic | Dimensions: 53 × 34 × 15 inches | Load capacity: 110 lbs | VIEW LATEST PRICE | See Our Full Breakdown |
| Thule Pulse 2 Roof-Mounted Cargo Box, 16 cu ft, Dual-Side Opening |  | Best Overall | Cargo capacity: 450 litres (16 cu ft) | Load capacity: 75 kg | Opening: Dual-side | VIEW LATEST PRICE | See Our Full Breakdown |
| Thule Pulse 2 M Roof-Mounted Cargo Box, 14 cu ft, Dual-Side Opening |  | Best Premium Compact | Cargo capacity: 400 litres (14 cu ft) | Load capacity: 75 kg | Opening: Dual-side | VIEW LATEST PRICE | See Our Full Breakdown |
| DNA Motoring Lockable Rooftop Cargo Box, 11 Cubic Feet, Glossy Black |  | Best Value Hard Shell | Capacity: 11 cubic feet | Maximum load: 110 lbs, evenly distributed | Dimensions: 53 in L × 34 in W × 15 in H | VIEW LATEST PRICE | See Our Full Breakdown |
| Auto Dynasty Hard-Shell Roof-Mounted Cargo Carrier |  | Best for Wide Crossbars | Dimensions: 53 × 34 × 15 inches | Capacity: 11 cubic feet | Weight limit: 110 lbs | VIEW LATEST PRICE | See Our Full Breakdown |
| SportRack Vista XL Rear-Opening Cargo Box, Black |  | Best for Rear Access | Internal cargo capacity: 18 cubic feet (510 L) | Material: UV-resistant ABS | Opening: Rear | VIEW LATEST PRICE | See Our Full Breakdown |
| TUFFIOM 13.4 cu. ft. Rooftop Cargo Box with Dual-Side Opening |  | Best for Side-to-Side Access | Storage capacity: 13.4 cu. ft. | Load capacity: 150 lbs | Dimensions: 61 × 27.6 × 13.8 in | VIEW LATEST PRICE | See Our Full Breakdown |
| WORKPRO 21-Cubic-Foot Waterproof Rooftop Cargo Carrier Bag |  | Best for Rack-Free Flexibility | Capacity: 21 cubic feet | Dimensions: 52 × 40 × 17 in | Material: 840D PVC | VIEW LATEST PRICE | See Our Full Breakdown |
| PM PERFORMOTOR Hard-Shell Rooftop Cargo Box, 13 cu ft |  | Best Compact Hard Shell | Model: PM-98528-A | Material: ABS plastic | Capacity: 13 cubic feet | VIEW LATEST PRICE | See Our Full Breakdown |
| GarveeTech Rooftop Cargo Box, Dual-Side Opening, 12 Cu. Ft., Black |  | Best for Lighter Loads | Material: ABS | Storage capacity: 12 cubic feet (340 L) | Dimensions: 54.3 × 31.5 × 13.4 in | VIEW LATEST PRICE | See Our Full Breakdown |
| Thule Motion 3 Rooftop Cargo Box |  | Best Premium Aero Pick | Brand: Thule | Product type: Rooftop cargo box | Dimensions: 81 × 38 × 18 in | VIEW LATEST PRICE | See Our Full Breakdown |
| FIVKLEMNZ 21-Cubic-Foot Waterproof Soft Rooftop Cargo Carrier |  | Best Soft-Side Capacity | Brand: FIVKLEMNZ | Capacity: 21 cubic feet | Dimensions: 52 × 40 × 18 inches | VIEW LATEST PRICE | See Our Full Breakdown |
| MIDABAO 20-Cubic-Foot Waterproof Car Roof Cargo Carrier |  | Best Value Soft Bag | Brand: MIDABAO | Model number: M-02 | Capacity: 20 cubic feet | VIEW LATEST PRICE | See Our Full Breakdown |
| Thule Force 3 XL Roof Cargo Box |  | Best Daily-Use Workhorse | Mounting system: Quick, secure mounting with attachment indicator | Access: Both sides of the vehicle | Locking system: SlideLock with separate locking and opening functions | VIEW LATEST PRICE | See Our Full Breakdown |
| Yakima SkyBox NX 18 XLG Rooftop Cargo Carrier, 18 Cu. Ft., Black |  | Best for Ski Trips | Brand: Yakima | Model: SkyBox NX 18 XLG | Part number: 8007370 | VIEW LATEST PRICE | See Our Full Breakdown |
| roof top cargo boxe | Material | Dimensions | Opening |
|---|---|---|---|
| Hard-Shell Rooftop Cargo Carri | ABS plastic | 53 × 34 × 15 inches | — |
| Thule Pulse 2 Roof-Mounted Car | ASA-ABS plastic | — | Dual-side |
| Thule Pulse 2 M Roof-Mounted C | ASA-ABS plastic | — | Dual-side |
| DNA Motoring Lockable Rooftop | Impact-resistant ABS | 53 in L × 34 in W × 15 in H | Side opening |
| Auto Dynasty Hard-Shell Roof-M | UV-protected, weather-resistant ABS | 53 × 34 × 15 inches | 14 inches wide; passenger-side access |
| SportRack Vista XL Rear-Openin | UV-resistant ABS | 63 × 38 × 19 in (160 × 96.5 × 48 cm) | Rear |
| TUFFIOM 13.4 cu. ft. Rooftop C | ABS | 61 × 27.6 × 13.8 in | Dual-side |
| WORKPRO 21-Cubic-Foot Waterpro | 840D PVC | 52 × 40 × 17 in | — |
| PM PERFORMOTOR Hard-Shell Roof | ABS plastic | 56.3 × 36.8 × 16.25 in | Dual-sided |
| GarveeTech Rooftop Cargo Box | ABS | 54.3 × 31.5 × 13.4 in | Dual-sided |
| Thule Motion 3 Rooftop Cargo B | — | 81 × 38 × 18 in | — |
| FIVKLEMNZ 21-Cubic-Foot Waterp | 840D PVC | 52 × 40 × 18 inches | — |
| MIDABAO 20-Cubic-Foot Waterpro | PVC-coated material | 51.1 × 39 × 17 inches | — |
| Thule Force 3 XL Roof Cargo Bo | — | — | — |
| Yakima SkyBox NX 18 XLG Roofto | — | — | — |
More Details on Our Top Picks
Hard-Shell Rooftop Cargo Carrier
Buyers who want hard-shell protection without a premium price will find this ABS box covers the basics well. The 110 lb load rating is higher than the Thule Pulse 2’s 75 kg ceiling, which matters if you’re hauling dense gear like camping equipment. Installation is tool-free, and the key lock plus weather-resistant shell keep contents protected on longer trips. Compared with the DNA Motoring box — which shares the same 53 × 34 × 15 inch footprint — the two are near twins, so the decision comes down to availability and price rather than capability. The tradeoffs are real: this box only fits vehicles with existing crossbars, and it lacks the dual-side opening or torque indicator of Thule’s options, so loading from the driver’s side means walking around the vehicle.
Pros:- 110 lb load capacity exceeds many hard-shell competitors
- Tool-free installation with included mounting hardware
- Key lock adds security over open carriers or soft bags
- Weather-resistant ABS shell protects luggage from rain and road grime
Cons:- Only compatible with vehicles that already have crossbars
- No dual-side access — loading is less convenient than on the Thule Pulse 2
Best for: First-time rooftop cargo box buyers with crossbars who want cheap, lockable hard-shell storage for occasional road trips
Not ideal for: Ski and snowboard travelers who need the longer, dual-side-access cargo bays of the Thule Pulse 2 lineup
- Material:ABS plastic
- Dimensions:53 × 34 × 15 inches
- Load capacity:110 lbs
- Vehicle compatibility:Vehicles with crossbars
- Lock:Key lock
- Included accessories:Pair of keys, 4 mounting brackets, mounting hardware
Our verdict“A sensible entry-level hard shell for crossbar-equipped vehicles when you need capacity and a lock more than refinement.”
Thule Pulse 2 Roof-Mounted Cargo Box, 16 cu ft, Dual-Side Opening
This is the pick that best balances capacity, access, and build quality. The 450-litre bay swallows luggage, skis, and snowboards, and the dual-side opening means you never have to climb into traffic-side loading positions — a genuine safety advantage over single-side boxes like the Auto Dynasty carrier. Thule’s tool-free mounting system with a torque indicator takes the guesswork out of whether the clamps are tight, something none of the budget ABS boxes offer. The ASA-ABS shell resists both weather and the scratching that plagues glossier finishes like the DNA Motoring’s black paint. The tradeoff: at 16 cubic feet and with brand-name construction, it demands more investment than budget options, and the 75 kg load limit is lower than the 110 lb ratings on cheaper boxes — a quirk of Thule prioritizing shell rigidity over raw weight ceiling.
Pros:- Dual-side opening allows loading from either side of the vehicle
- Torque indicator confirms correct mounting tension every time
- Scratch- and weather-resistant ASA-ABS shell stays looking new
- Aerodynamic shape designed to preserve full trunk access when mounted forward
Cons:- 75 kg load limit is lower than budget competitors’ 110 lb ratings
- Premium brand pricing compared with generic hard-shell carriers
Best for: Frequent road-trippers and winter-sports families who want the easiest loading experience and long-term durability
Not ideal for: Occasional users on tight budgets who would be better served by a basic ABS box at a fraction of the cost
- Cargo capacity:450 litres (16 cu ft)
- Load capacity:75 kg
- Opening:Dual-side
- Mounting:Roof-mounted
- Material:ASA-ABS plastic
- Installation:Tool-free system with torque indicator
Our verdict“If you want one roof box that does everything well for years of trips, this is the one to beat.”
Thule Pulse 2 M Roof-Mounted Cargo Box, 14 cu ft, Dual-Side Opening
The M size is the smarter choice when a 16-cubic-foot box would overwhelm a smaller roofline or garage clearance. You keep nearly everything that makes the larger Pulse 2 the roundup’s top pick — dual-side access, torque-indicator mounting, and the same rugged ASA-ABS shell — while giving up 50 litres of space. Mounted in the forward position, it preserves full trunk access on hatchbacks and wagons, a detail that matters for anyone who’s fought a sedan’s trunk lid against an oversized box. Compared with the Auto Dynasty carrier at the same general footprint, this box wins on material quality and mounting precision, though the budget alternative still carries more weight. The compromise is capacity-for-cost: you pay Thule money for less volume than some cheaper boxes in this guide.
Pros:- Compact 14 cu ft size suits smaller vehicles and low garages
- Dual-side opening plus torque-indicator mounting inherited from the larger model
- Forward-position mounting preserves full trunk access
- Weather- and scratch-resistant ASA-ABS construction
Cons:- Less cargo volume than similarly priced larger boxes
- 75 kg load limit trails budget ABS carriers
Best for: Drivers of sedans, hatchbacks, and wagons who need premium build in a right-sized package
Not ideal for: Large families packing for week-long trips who need every cubic foot the bigger Thule Pulse 2 or Yakima SkyBox NX 18 provides
- Cargo capacity:400 litres (14 cu ft)
- Load capacity:75 kg
- Opening:Dual-side
- Mounting:Tool-free system with torque indicator
- Material:ASA-ABS plastic
- Vehicle access:Forward position allows full trunk access
Our verdict“The right Thule for people who want the brand’s quality but don’t need — or can’t fit — a full-size box.”
DNA Motoring Lockable Rooftop Cargo Box, 11 Cubic Feet, Glossy Black
For shoppers who want lockable hard-shell storage at a value price, this DNA Motoring box delivers the essentials without frills. The impact-resistant ABS shell does the same weather-protection job as pricier options, and the side-opening lid that stays open until closed is a genuinely useful touch — no wrestling a lid while loading, which budget boxes often get wrong. Its 110 lb evenly distributed load rating beats the Thule Pulse 2 M’s capacity ceiling for heavy, dense cargo. The glossy black finish looks sharp on the lot but shows swirls and scratches far more readily than Thule’s scratch-resistant ASA-ABS, so expect cosmetic wear over seasons of use. Like the Auto Dynasty carrier it competes with, it demands crossbars, and the single-side opening means less flexibility than dual-access rivals.
Pros:- Side-opening lid stays open hands-free during loading
- 110 lb load capacity handles heavier cargo than premium compact boxes
- Impact-resistant ABS shell with a keyed lock
- 11 cubic feet of added storage without interior cabin intrusion
Cons:- Requires a vehicle with crossbars
- Glossy finish is prone to visible scratching over time
- Single-side opening is less convenient than dual-side access
Best for: Weekend road-trippers with crossbars who want maximum hard-shell value and a secure, self-holding lid
Not ideal for: Buyers who prioritize long-term appearance, since the glossy finish scratches more easily than matte ASA-ABS shells
- Capacity:11 cubic feet
- Maximum load:110 lbs, evenly distributed
- Dimensions:53 in L × 34 in W × 15 in H
- Material:Impact-resistant ABS
- Finish:Glossy black
- Locking system:Keyed lock
- Opening:Side opening
Our verdict“A strong value hard shell for occasional use, as long as you accept cosmetic wear and one-sided loading.”
Auto Dynasty Hard-Shell Roof-Mounted Cargo Carrier
This box’s quiet strength is fit flexibility: its tool-free brackets accept crossbars up to 13 inches wide, which covers aftermarket and factory racks that some competitors won’t grip securely. Like the DNA Motoring box, it offers 11 cubic feet, a 110 lb weight rating, and a keyed lock, so the two compete almost head-to-head — Auto Dynasty trades the glossy finish for a UV-protected surface that should hold up better against sun fading over summers on the roof. The 14-inch-wide passenger-side opening is narrower than a dual-side Thule, so loading bulky duffels takes more patience, and access from the curb only happens if you park accordingly. The 110 lb ceiling also caps how much dense gear you can load despite the cubic footage.
Pros:- Fits crossbars up to 13 inches wide, wider than many competitors accommodate
- UV-protected ABS resists sun fading better than standard glossy finishes
- Tool-free mounting brackets install quickly
- Keyed locking system secures contents
Cons:- Passenger-side-only access limits loading flexibility
- 110 lb weight limit restricts heavy cargo loads
Best for: Owners of vehicles with unusually wide factory or aftermarket crossbars who struggle to find a compatible box
Not ideal for: Drivers who frequently load gear from either side and would benefit from a dual-opening box like the Thule Pulse 2
- Dimensions:53 × 34 × 15 inches
- Capacity:11 cubic feet
- Weight limit:110 lbs
- Material:UV-protected, weather-resistant ABS
- Crossbar compatibility:Up to 13 inches wide
- Opening:14 inches wide; passenger-side access
- Included:Cargo box, 2 security keys, 4 mounting brackets
Our verdict“The pragmatic choice when crossbar width rules out other boxes, provided one-sided loading doesn’t bother you.”
SportRack Vista XL Rear-Opening Cargo Box, Black
The SportRack Vista XL suits drivers who want a roomy hard-shell box they can reach from behind the vehicle. Its rear opening lets you load from the curb side without leaning into traffic, while the 18-cubic-foot interior offers more space than the 13-cubic-foot PM PERFORMOTOR. Tool-free mounting and an included lock and key simplify setup and basic cargo security. The tradeoff is access: unlike the TUFFIOM and PM PERFORMOTOR boxes, it does not open from both sides, so loading can be awkward when gear is buried at the front. Before buying, check the rack fit guide and crossbar spacing; its 100-pound capacity is also lower than some smaller boxes. This is a practical pick when rear access matters more than side-to-side convenience.
Pros:- 18 cubic feet of storage for bulky trip gear
- Rear opening gives access away from road traffic
- Tool-free mounting hardware simplifies installation and removal
- Includes a lock and key
Cons:- Rear-only opening can make it harder to reach cargo near the front
- 100-pound maximum load is lower than the TUFFIOM’s listed 150-pound capacity
- Rack compatibility and crossbar spacing require checking before purchase
Best for: Drivers with compatible crossbars who want generous storage and prefer loading from the rear, away from passing traffic
Not ideal for: Drivers who need to load from either side, have crossbars outside the specified spacing, or regularly carry loads above 100 pounds
- Internal cargo capacity:18 cubic feet (510 L)
- Material:UV-resistant ABS
- Opening:Rear
- Mounting:Tool-free hardware
- Maximum weight capacity:100 lb (45 kg)
- Dimensions:63 × 38 × 19 in (160 × 96.5 × 48 cm)
- Crossbar spacing:23 5/8–29 3/4 in (60–75.5 cm)
- Compatible racks:SportRack systems, square bars, round bars, and most factory racks
Our verdict“Choose the Vista XL if you want 18 cubic feet of hard-shell storage and rear access, and your rack meets its fit requirements.”
TUFFIOM 13.4 cu. ft. Rooftop Cargo Box with Dual-Side Opening
The TUFFIOM 13.4 makes access its main advantage: the lid opens from either side, which helps when a wall, neighboring car, or packed roof rack blocks one approach. Its ABS shell and included locks suit travelers who want a rigid enclosure for ordinary exposure to sun, rain, and dust. Compared with the larger SportRack Vista XL, it gives up 4.6 cubic feet, but its 150-pound listed load capacity is higher than the Vista XL’s 100 pounds. That makes it a more flexible choice for denser gear, provided the vehicle and rack can support the load. It still depends on compatible crossbars, and buyers need to peel off the protective film before use. The dual-side opening is the deciding benefit; capacity-focused shoppers may prefer a larger box.
Pros:- Dual-side opening makes loading easier in tight parking situations
- 150-pound listed load capacity exceeds the Vista XL’s 100-pound limit
- ABS shell helps shield cargo from sun, rain, and dust
- Locks and keys are included
Cons:- 13.4 cubic feet offers less room than the SportRack Vista XL
- Requires compatible vehicle crossbars
- Protective film must be removed before use
Best for: Road-trippers with compatible crossbars who often load from whichever side of the vehicle is accessible
Not ideal for: Families packing lots of bulky luggage who need more than 13.4 cubic feet of enclosed space
- Storage capacity:13.4 cu. ft.
- Load capacity:150 lbs
- Dimensions:61 × 27.6 × 13.8 in
- Weight:Approximately 24.25 lbs
- Material:ABS
- Opening:Dual-side
- Locking system:Locks on both sides; keys included
- Warranty:3 years
Our verdict“Pick the TUFFIOM if access from either side and a higher listed load limit matter more than maximum cargo volume.”
WORKPRO 21-Cubic-Foot Waterproof Rooftop Cargo Carrier Bag
The WORKPRO 21-cubic-foot bag is the flexible choice for buyers who need substantial extra room but do not have roof crossbars. Its straps, door hooks, and included anti-slip mat let it attach to a range of sedans, SUVs, RVs, and wagons. The 840D PVC construction uses welded and double-stitched seams, but a soft carrier cannot hold its shape or protect contents from impacts like the ABS boxes. Its 21-cubic-foot capacity is larger than the SportRack Vista XL, though loading and organizing soft luggage is less structured than using that hard shell. The supplied instructions matter: poor strap placement can damage the bag and compromise its weather protection, which is not guaranteed in extreme conditions or if the bag is damaged. Choose it for adaptable capacity, not hard-shell security.
Pros:- 21 cubic feet of capacity exceeds the SportRack Vista XL
- Can mount with door hooks and straps without a special roof rack
- Welded, double-stitched 840D PVC construction
- Includes an anti-slip mat, storage bag, and reinforced straps
Cons:- Soft sides provide less structure and impact protection than hard-shell boxes
- Waterproof performance is not guaranteed in extreme weather or if damaged
- Incorrect strap placement can cause tearing and leaks
Best for: Travelers without roof racks who need extra luggage space and can secure a soft carrier carefully
Not ideal for: Drivers carrying fragile gear or traveling in severe weather who want a rigid, impact-resistant enclosure
- Capacity:21 cubic feet
- Dimensions:52 × 40 × 17 in
- Material:840D PVC
- Mounting:10 adjustable straps and 6 door hooks
- Included accessories:Anti-slip mat, storage bag, safety hooks, reinforced straps, user manual
- Vehicle compatibility:Sedan, SUV, RV, wagon
- Warranty:2 years
Our verdict“Choose the WORKPRO if you need high capacity without crossbars and are comfortable securing a soft-sided carrier correctly.”
PM PERFORMOTOR Hard-Shell Rooftop Cargo Box, 13 cu ft
The PM PERFORMOTOR 13 cu ft is a compact hard-shell option for drivers who want enclosed, weather-resistant storage without giving up as much roof space as a large carrier. Its dual-sided opening and included keys make everyday loading more flexible than the rear-only SportRack Vista XL, while the impact-resistant ABS shell gives fragile luggage more structure than the soft-sided WORKPRO bag. At 13 cubic feet, it carries less than either of those alternatives, and it needs crossbars, so it will not solve storage needs for a rack-free vehicle. The 110-pound maximum must be distributed evenly across the box. Buyers should also note that the supplied product information is limited, so fit should be confirmed against the vehicle and crossbars before purchase.
Pros:- Compact 13-cubic-foot hard-shell storage
- Waterproof, impact-resistant ABS construction
- Dual-sided opening eases access from either side
- Includes mounting brackets, hardware, and keys
Cons:- Requires factory or aftermarket crossbars
- 110-pound maximum load must be evenly distributed
- Smaller capacity than the SportRack Vista XL and WORKPRO bag
Best for: Drivers with crossbars who want a lockable, dual-opening hard shell for moderate loads and limited roof space
Not ideal for: Rack-free vehicle owners or travelers who need the 18-plus cubic feet offered by the Vista XL or WORKPRO
- Model:PM-98528-A
- Material:ABS plastic
- Capacity:13 cubic feet
- Maximum load:110 lbs, evenly distributed
- Dimensions:56.3 × 36.8 × 16.25 in
- Water resistance:Waterproof
- Opening:Dual-sided
- Mounting:Roof mount; requires crossbars
Our verdict“The PM PERFORMOTOR fits drivers who want a compact, dual-opening hard shell and already have compatible crossbars.”
GarveeTech Rooftop Cargo Box, Dual-Side Opening, 12 Cu. Ft., Black
The GarveeTech 12 cu ft box is a straightforward pick for drivers who want a weather-resistant hard shell for lighter trip loads. It opens from either side, like the TUFFIOM and PM PERFORMOTOR, but its 12-cubic-foot capacity is smaller than both. Its listed 165-pound maximum is higher than those alternatives, though buyers should follow vehicle and rack limits as well as the box limit. The ABS shell is described as weather- and UV-resistant, and the package includes keys and straps. One side must be locked while the other is open, so access is flexible but not fully independent. It also requires a roof rack and has a one-year warranty, with conflicting warranty durations in the product information. This is best for modest cargo when dual-side access and a higher listed load capacity take priority over volume.
Pros:- Dual-sided opening allows access from either side
- 165-pound listed maximum capacity is higher than the TUFFIOM and PM PERFORMOTOR limits
- Weather- and UV-resistant ABS shell
- Includes two keys and two straps
Cons:- 12-cubic-foot capacity is smaller than the TUFFIOM and PM PERFORMOTOR
- Requires a compatible roof rack and fit should be checked
- One side must be locked when opening the other; warranty information conflicts
Best for: Drivers with roof racks who carry compact, relatively dense gear and want dual-side access
Not ideal for: Families packing bulky luggage or buyers who need a clear, consistent warranty term before purchase
- Material:ABS
- Storage capacity:12 cubic feet (340 L)
- Dimensions:54.3 × 31.5 × 13.4 in
- Maximum weight capacity:165 lbs
- Opening:Dual-sided
- Compatibility:Vehicles equipped with a roof rack
- Included accessories:2 keys and 2 straps
- Warranty:One year listed; product information also lists 30 days
Our verdict“Choose the GarveeTech for compact cargo and dual-side access if you have a compatible rack and can confirm the warranty terms.”
Thule Motion 3 Rooftop Cargo Box
The Thule Motion 3 is the closest thing to a no-compromise cargo box in this roundup. Its wing-shaped aerodynamic profile is the real story here: compared with boxier models like the Thule Force 3 XL, it sits lower and cleaner in the airflow, which matters on long highway trips where drag translates directly into fuel cost and wind noise. The PowerClick mounting system with a torque indicator removes the guesswork from installation, and the wide handle genuinely allows one-handed opening when your other arm is holding a duffel.
The tradeoff is the price of the Thule ecosystem: the interior light, protective liner, and storage cover are all optional extras rather than included, which stings on a premium purchase. Still, for buyers who keep the box mounted year-round, this model makes the most sense.
Pros:- Aerodynamic wing profile reduces drag and wind noise compared with boxier designs
- PowerClick quick-mount with torque indicator confirms proper installation
- Wide handle allows genuine one-handed opening and closing
- SlideLock gives clear confirmation the lid is securely closed
Cons:- Interior light, protective liner, and storage cover are all sold as optional accessories
- Premium price positions it well above value-oriented hard shells like the TUFFIOM
Best for: Frequent road-trippers and daily drivers who want the lowest drag and quietest ride a hard shell can offer
Not ideal for: Occasional-use buyers on a budget, since the premium price plus paid accessories adds up fast for a few trips a year
- Brand:Thule
- Product type:Rooftop cargo box
- Dimensions:81 × 38 × 18 in
- Mounting system:PowerClick quick-mount with torque indicator
- Locking system:SlideLock
- Included component:Rooftop cargo carrier
- Warranty:Limited lifetime
Our verdict“Buyers who drive long distances with a box mounted regularly will justify the cost; everyone else should look at cheaper hard shells first.”
FIVKLEMNZ 21-Cubic-Foot Waterproof Soft Rooftop Cargo Carrier
Among the soft bags in this roundup, the FIVKLEMNZ 21-cubic-foot carrier stands out for sheer volume combined with serious weatherproofing. Its 840D PVC construction and high-frequency welded seams put it a step above the MIDABAO’s PVC-coated fabric when rain is the main concern — welded seams don’t rely on stitching that can wick water. The accessory bundle is generous too: ten reinforced straps, six door hooks, an anti-slip mat, and a luggage lock mean you’re not shopping for extras.
The tradeoff is inherent to soft bags. Unlike a rigid box such as the Thule Pulse 2, there’s no structure, so careless loading and loose strapping will let it flap or shift at highway speeds. This pick makes the most sense for infrequent travelers who want maximum space for minimum money and garage space — it folds into a storage bag when you’re done.
Pros:- 21 cubic feet of capacity, the largest in this batch
- Welded seams and double-layer cover deliver strong waterproofing for soft-bag standards
- Works with or without a roof rack using included door hooks
- Complete accessory kit including straps, anti-slip mat, lock, and storage bag
Cons:- Requires careful tensioning and packing to stay stable at highway speeds
- No hard protection for fragile or valuable gear compared with rigid boxes
Best for: Budget-minded families who need maximum cargo volume for occasional trips and can store a bag but not a rigid box
Not ideal for: Anyone who wants to load gear in rain without fuss or leave the carrier mounted — soft bags lack the rigidity and security of hard shells
- Brand:FIVKLEMNZ
- Capacity:21 cubic feet
- Dimensions:52 × 40 × 18 inches
- Material:840D PVC
- Seams:High-frequency welded
- Mounting:Fits vehicles with or without a roof rack
- Included accessories:10 reinforced straps, 6 door hooks, anti-slip mat, luggage lock, storage bag
- Warranty:12 months
Our verdict“The best choice when cubic feet per dollar and pack-away storage matter more than rigidity and security.”
MIDABAO 20-Cubic-Foot Waterproof Car Roof Cargo Carrier
The MIDABAO covers nearly the same footprint as the FIVKLEMNZ — 51.1 × 39 × 17 inches versus 52 × 40 × 18 — for what is typically a lower outlay, making it the smarter buy when the budget is the deciding factor. Its PVC-coated material and coated zippers handle rain and road spray respectably, and like the FIVKLEMNZ it mounts with or without a roof rack, so bare-roof sedans are covered.
Where it cedes ground is construction: the coating-based waterproofing is a step behind the FIVKLEMNZ’s welded seams in sustained downpours, and the strap count is lighter — six short straps and two long ones versus ten reinforced straps. The flexible, fold-flat design is a genuine perk for apartment dwellers, but the lack of internal structure means you’ll want to pack soft goods only. Compared with even a small hard shell like the DNA Motoring 11-cubic-foot box, it trades security and rigidity for raw space and price.
Pros:- 20 cubic feet of capacity at a lower price point than comparable soft bags
- Fits vehicles with or without roof racks
- Coated zippers and PVC-coated material keep contents dry in typical conditions
- Folds flat into its storage bag between trips
Cons:- Coated-seam construction is less watertight than the FIVKLEMNZ’s welded seams in prolonged rain
- Fewer tie-down straps means more care needed to prevent flapping at speed
- No rigid structure or lockable security for valuable gear
Best for: First-time roof cargo buyers with bare roofs or small racks who want big capacity at the lowest possible entry price
Not ideal for: Travelers hauling gear through heavy sustained rain or carrying valuables, since coated seams and no lock can’t match hard-shell protection
- Brand:MIDABAO
- Model number:M-02
- Capacity:20 cubic feet
- Dimensions:51.1 × 39 × 17 inches
- Material:PVC-coated material
- Compatibility:Cars with or without roof racks
- Fastening:6 short tie straps and 2 long straps
- Included accessories:Anti-slip mat and storage bag
Our verdict“A sensible budget entry into rooftop hauling for occasional soft-gear trips, as long as you accept soft-bag limitations.”
Thule Force 3 XL Roof Cargo Box
The Force 3 XL occupies the sweet spot in Thule’s lineup: it inherits the SlideLock system and quick-mount attachment indicator from the pricier Motion 3 but skips the aero wing profile, landing at a friendlier price for buyers who use a box constantly rather than obsessively. Dual-sided access is the standout practical feature — unlike rear-opening boxes like the SportRack Vista XL, you can load from either side of the vehicle, which saves contorting yourself in tight parking spots.
Its Thule Test Center certification for road safety and durability is a genuine differentiator against budget hard shells from Auto Dynasty or TUFFIOM, which don’t publish equivalent testing. The compromise is aerodynamics: the boxier shape creates more drag and noise than the Motion 3, so frequent long-haul drivers may feel it at the pump. For daily gear-hauling duty, though, this model is better suited than nearly anything else here.
Pros:- Quick-mount system with an indicator that confirms secure attachment
- Dual-sided access makes loading easy regardless of curb position
- SlideLock separates locking from opening for clear security confirmation
- Tested at the Thule Test Center for road safety and durability
Cons:- Boxier shape is less aerodynamic and louder than the Thule Motion 3
- Costs considerably more than budget hard shells with similar raw capacity
- Lacks the premium interior accessories available on the Motion line
Best for: Active households and daily drivers who want Thule-grade durability and convenience without paying Motion 3 money
Not ideal for: Long-distance commuters focused on fuel economy, since the boxier profile creates more drag than the Motion 3’s aero shape
- Mounting system:Quick, secure mounting with attachment indicator
- Access:Both sides of the vehicle
- Locking system:SlideLock with separate locking and opening functions
- Safety testing:Tested at the Thule Test Center
- Intended use:Daily use and active lifestyles
- Brand:Thule
Our verdict“The rational Thule choice for people who mount a box weekly and value proven durability over aero refinement.”
Yakima SkyBox NX 18 XLG Rooftop Cargo Carrier, 18 Cu. Ft., Black
The Yakima SkyBox NX 18 earns its spot for one clear reason: it swallows skis and snowboards up to 195 cm, which immediately rules out shorter boxes like the Thule Pulse 2 M for winter-sports households. Its dual-sided opening matches the Thule Force 3 XL for loading convenience, and the included SKS locks secure both the lid and the box to the rack — a meaningful security advantage over every soft bag in this roundup, none of which offer real lockability.
The flattened interior floor and textured lid and base are practical touches that keep gear from shifting and hide scuffs from bindings and boot bags. The limitation versus premium Thule models is refinement rather than function: there’s no torque-indicator mount system like the Motion 3’s PowerClick, so installation requires a bit more attention. For skiers, snowboarders, and gear-heavy adventurers, though, this is the most capable all-arounder of the batch.
Pros:- Fits skis and snowboards up to 195 cm — longer than most boxes can handle
- Dual-sided opening makes loading easy from either curb
- SKS locks included for both lid and box security
- Flattened interior floor and textured surfaces add practical durability
Cons:- No torque-indicator mounting system like Thule’s PowerClick, so fit checks are manual
- Priced above larger-capacity budget boxes with similar raw volume
- 18 cu. ft. is smaller than the biggest boxes in the roundup
Best for: Ski and snowboard families who need to fit long gear plus luggage in one lockable, dual-access box
Not ideal for: Buyers who want maximum cubic feet for the money, since 18 cu. ft. costs more here than larger budget hard shells
- Brand:Yakima
- Model:SkyBox NX 18 XLG
- Part number:8007370
- Capacity:18 cu. ft.
- Access:Dual-sided opening
- Locks:SKS locks included
- Ski/snowboard length:Up to 195 cm
- Mounting:Universal
- Warranty:Limited lifetime
Our verdict“The clear pick if winter sports gear is your primary cargo; overkill-priced if you just need generic storage space.”
How We Picked
I evaluated each cargo box against the factors that actually decide satisfaction after purchase: real usable capacity versus claimed capacity, mounting speed and compatibility with different crossbar spreads, weather sealing under highway rain and car-wash pressure, lock and latch quality, and the aerodynamic penalty at the pump. I also weighed access design heavily — dual-side opening changes how you load a box every single trip, while rear or single-side access is a daily compromise. For soft bags, I judged fabric denier, zipper covers, seam taping and whether the bag holds its shape without a rigid foundation.
The ranking order reflects a simple logic: boxes that combine secure mounting, all-weather sealing and convenient access rank highest, with premium brands earning top spots only when their advantages justify the added cost. Budget hard shells rank in the middle tier when they deliver honest capacity and acceptable hardware, while soft bags sit lower because none of them can offer security — no matter how waterproof the fabric is. Where two models are nearly identical on paper, like the Thule Pulse 2 and Pulse 2 M, I ranked by which size serves the broader range of vehicles and family loads.
Factors to Consider When Choosing Roof Top Cargo Boxes
Before matching a specific box to your roof, it helps to understand the decisions that trip up most first-time buyers. These are the factors I weighed during this comparison, explained in more depth than the individual reviews allow.Measure Your Crossbar Spread Before Anything Else
The single most common mistake in this category is buying a box that physically cannot mount to your rack. Every hard shell has a minimum and maximum crossbar spread it accommodates, and a surprising number of budget boxes have narrow windows that exclude factory racks on popular SUVs. Measure the distance between your crossbars center-to-center, then check both the mounting hardware range and the total box length against your vehicle’s roof. A box that overhangs the windshield or the rear hatch when opened will be a daily annoyance or an outright return. This is also why the Pulse 2 M outranks some larger boxes in this roundup for smaller cars — fit beats capacity every time.
Hard Shell Versus Soft Bag: The Real Tradeoff
Soft bags like the WORKPRO, FIVKLEMNZ and MIDABAO carriers cost a fraction of a rigid box and fold flat for storage, which makes them tempting for once-a-year vacationers. But the tradeoffs go beyond security: soft bags rely entirely on your roof rack for structure, flap at highway speed when underpacked, and expose contents to damage from above. Hard shells shed rain without effort, lock against theft, and let you stack and compress gear. My honest guidance is that soft bags make sense only for occasional fair-weather trips in vehicles with solid crossbars — if you travel more than a few times a year, the hard-shell premium pays for itself in convenience alone.
Opening Style Determines Daily Usability
Dual-side opening, featured on the Thule models, the TUFFIOM and the GarveeTech, lets you load from either side of the vehicle regardless of how you park — a bigger quality-of-life upgrade than most buyers expect. Rear-opening boxes like the SportRack Vista XL solve a different problem: they work on tall vehicles where side access is awkward, and they let you stand at the tailgate while loading. Single-side or top-access boxes are the weakest design and I’d only accept them at the lowest price points. Think about where you actually load your car — curbside, in a garage, at a trailhead — and match the opening style to that reality.
Capacity: Buy One Size Larger Than You Think
Manufacturer cubic-foot figures describe sealed volume, not usable space — wheel wells, sloped lids and latch housings eat into what you can actually pack. A 14 cu ft box realistically swallows three medium duffels and a couple of loose items, not the five-bag loads the number implies. Families typically find that a 16-18 cu ft box is the sweet spot for week-long trips, which is why the Thule Force 3 XL and Yakima SkyBox NX 18 rank so well here. Also remember that a loaded box plus cargo can approach 100+ pounds at the roof, raising your center of gravity — check your vehicle’s dynamic roof load rating, not just the static one.
Fuel Economy and Noise Are Real Costs
A box on your roof costs fuel on every mile driven, and the difference between a streamlined premium shell and a slab-sided budget box can be meaningful over a long trip. Premium models like the Thule Motion 3 are shaped specifically to manage airflow and stay quiet above 65 mph, while boxy budget carriers generate noticeable wind noise and drag. If you leave the box mounted year-round, aerodynamics should weigh heavily in your decision; if you mount it only for vacation weeks, a cheaper box’s fuel penalty matters far less. Removing the box when not in use is the single best move for both fuel economy and longevity of the seals.
Locks, Keys and Long-Term Durability
Locking systems separate the tiers of this category more than any other component. Thule and Yakima use centralized locking that secures the lid at multiple points with one key, while budget boxes often use single-point locks that can be defeated with prying and may freeze or corrode after a few seasons. Consider whether the box will sit on your car overnight at trailheads or hotels — if yes, lock quality is a security decision, not a convenience feature. UV exposure is the other longevity factor: gloss-finish budget boxes like the DNA Motoring can chalk and fade within a couple of summers, while textured premium shells age far more gracefully.
Frequently Asked Questions
Will a roof cargo box fit my car without a factory rack?
No hard-shell box mounts to a bare roof — every model in this roundup, from the Thule Motion 3 down to the GarveeTech, requires crossbars to clamp onto. If your vehicle has factory side rails, you may only need a crossbar kit, which is a modest add-on. Vehicles with completely bare roofs need a full baseline rack system, which adds cost and installation time before the box even enters the picture. Soft bags technically sit on a bare roof with straps through the doors, but I strongly discourage that method at highway speed — it risks paint damage and poor retention. Budget for the rack first, then choose the box that fits its spread.
Is a 21-cubic-foot soft bag better value than a 16-cubic-foot hard box?
On paper the capacity per dollar favors the bag, and for truly occasional users the WORKPRO or FIVKLEMNZ carriers are legitimately practical. But the comparison breaks down in daily use: a soft bag needs careful packing and full straps to keep its shape, offers zero theft protection, and its zippers are the weak point even with rain covers. A hard box like the Thule Pulse 2 at 16 cu ft protects contents from weather, impact and opportunistic theft while loading in half the time. If you travel more than two or three times a year, the hard shell is the better long-term purchase despite the higher entry cost. The bag wins mainly for storage-conscious buyers who use it rarely.
Do I need dual-side opening, or is it a gimmick?
Dual-side opening is one of the few features I consider worth paying extra for, because it affects every single loading session. It lets you park against a wall or on the passenger side of a curb and still access the entire box, and it makes it possible for two people to pack simultaneously. Rear-opening boxes like the SportRack Vista XL are the exception — they make sense on tall SUVs where side reach is difficult. Single-side boxes force you to reposition the car or climb in from one side, which gets old quickly on multi-stop trips. If your budget forces a choice between dual-side access and slightly more capacity, take the access.
How much does a cargo box hurt my gas mileage?
Expect a measurable drop — typically in the range of a few percent at highway speeds for an aerodynamic box, and more for boxy or underfilled soft bags. The penalty comes from two sources: frontal area, which every box adds, and drag coefficient, which varies widely by shape. Streamlined shells like the Thule Motion 3 are specifically sculpted to minimize this, which is part of what you pay for at the premium tier. Over a two-week vacation the extra fuel cost is modest; mounted year-round, it adds up. The practical answer is to remove the box between trips, which also extends the life of the lid seals and mounting hardware.
Can I open my rear hatch with a cargo box installed?
Usually yes, but it depends on box length, roof length and where the box sits on your crossbars — and this is one of the most common compatibility surprises buyers hit. Long boxes on short vehicles, like an 18 cu ft carrier on a compact crossover, can physically block the hatch from opening fully. Before buying, check the box’s total length against your roof and slide the box as far forward as safely possible during installation. Some manufacturers publish vehicle-fit guidance; Thule and Yakima both offer fit tools that account for hatch interference. Rear-opening boxes like the Vista XL avoid the question entirely since you access them from the back, which is a genuine advantage on shorter vehicles.
Conclusion
For the best overall rooftop cargo box, the Thule Motion 3 is the clear winner — it combines aerodynamic efficiency, secure centralized locking and effortless dual-side access in a way no budget box matches. The best premium pick for maximum hauling is the Thule Force 3 XL, with the Yakima SkyBox NX 18 as its closest rival if you prefer Yakima’s mounting hardware. Best value goes to the TUFFIOM 13.4 cu ft, which delivers dual-side opening and honest capacity at a fraction of the Thule price, while the Thule Pulse 2 M is the smartest choice for smaller vehicles that can’t swallow a full-size box. Beginners who want the simplest possible first purchase should start with the Thule Pulse 2 — its tool-free mounting and forgiving design remove the learning curve entirely. For specific needs: tall-vehicle owners should pick the SportRack Vista XL for its rear access, strict budgets should look at the DNA Motoring or GarveeTech boxes, and occasional travelers who want fold-flat storage should choose the WORKPRO or FIVKLEMNZ soft bags. Match the box to your rack, your vehicle and your trip frequency, and any of these picks will serve you well.
Evergreen bestsellers Picks
bestsellers
As an affiliate, we earn on qualifying purchases.
