A roof cargo box can make a long trip more comfortable by moving luggage and gear out of the cabin. The right choice depends on more than storage volume: check how the box opens, whether it fits your roof rack, and how its weight affects your vehicle’s roof-load limit. These five options range from compact, low-profile designs to roomy boxes for family luggage and winter gear.
Quick Comparison
| Roof Cargo Box | Capacity | Access | Notable detail |
|---|---|---|---|
| SportRack Vista XL Rear Opening Cargo Box | 18 cu. ft. | Rear opening | 100-pound maximum load |
| 14 Cubic Feet Rooftop Cargo Box Carrier | Advertised as 14 cu. ft. | Dual-side opening | Listing states a load limit up to 135 pounds |
| Thule Motion 3 XL Rooftop Cargo Box | 18 cu. ft. | Wide lid access | 165-pound capacity; made for select Thule rack systems and adapters |
| munirater 14 Cubic Feet Rooftop Box | 14 cu. ft. | Dual-side opening | 56.3 × 25.98 × 16.14 inches |
| INNO Wedge 660 | 11 cu. ft. | Dual-side opening | Low-profile design for skis and snowboards |
Our Picks: Best Roof Cargo Boxes For Long Trips reviews
SportRack Vista XL: Roomy Storage with Rear Access
The Vista XL offers 18 cubic feet of storage in a hard-shell box made from UV-resistant ABS. Its rear-opening lid is designed to let you load and unload from the back of the vehicle, away from roadside traffic. That access style can be useful when you park beside a busy road or want to keep clear of adjacent parking spaces.
SportRack lists a 100-pound maximum load and dimensions of 63 × 38 × 19 inches. The box uses tool-free mounting hardware and includes a lock and key. It fits SportRack systems, square and round bars, and many factory racks, but you should check the fit guide and confirm your crossbar spacing falls within the stated 23⅝-to-29¾-inch range.
Its size makes it a practical option for travelers who need substantial storage without focusing on ski-length cargo. A limitation is that rear access may be less convenient than a dual-side design when the box is positioned under a low garage or when you need to reach a specific item from beside the vehicle. The supplied product information also marks this listing as unavailable, so check its current status before planning a purchase.
Pros:
- Generous 18-cubic-foot capacity
- Rear opening keeps loading away from roadside traffic
- Tool-free mounting hardware and included lock
- Fits several common bar styles, subject to fit-guide checks
Cons:
- Maximum load is 100 pounds
- Listing is marked unavailable in the supplied product information
Verdict: Choose the Vista XL if you want a large box with rear access and your rack meets its fit requirements, but verify availability before settling on it.
14-Cubic-Foot Dual-Side Box: Flexible Access for Road Trips
This hard-shell carrier is listed with an advertised capacity of 14 cubic feet and a load limit of up to 135 pounds. Its dual-side opening gives you access from either side of the vehicle, which can make loading easier when parking conditions or the position of your roof rack limit access from one side.
The ABS shell is described as weather-protective, and the box includes locks and keys. It is presented as a universal-fit option for vehicles with roof racks, but “universal” does not mean it fits every rack or vehicle. Check the rack style, bar spacing, mounting hardware, and your vehicle’s roof-load limit before buying.
There is an important detail to verify: the listing description mentions 11.5-, 13.5-, and 14-cubic-foot versions, while the product title identifies a 14-cubic-foot box. Confirm the exact version and capacity on the listing. This is a more flexible access choice than the rear-opening SportRack, but it provides less stated storage than the 18-cubic-foot options.
Pros:
- Dual-side opening for access from either side of the vehicle
- Advertised 14-cubic-foot capacity
- Listing states a maximum load of up to 135 pounds
- Includes locks and keys
Cons:
- Product details describe more than one capacity, so verify the exact model
- Vehicle and rack fit need to be checked before purchase
Verdict: This box is worth considering if dual-side access matters to you, provided you confirm the capacity and fit details for the exact listing.
Thule Motion 3 XL: Large Capacity for Luggage and Snow Gear
The Motion 3 XL combines 18 cubic feet of storage with a wing-shaped profile and a forward-leaning nose. Thule describes the shape as designed to reduce drag. Its listed capacity is 165 pounds, but the vehicle and roof-rack limits still apply, and the lowest limit governs how much you can carry.
The PowerClick mounting system has a torque indicator that clicks when properly mounted. A wide handle and lid pull straps are intended to make opening and closing easier, while the SlideLock system separates the locking and opening functions and indicates when the lid is closed securely. These features make the box a strong fit for people who expect to open it often during a trip.
It is also the clearest choice in this group for long winter gear: the listed internal length is 80 inches, and Thule says it can hold skis up to 200 cm or multiple snowboards. The trade-offs are its substantial footprint—84.7 × 35 × 17 inches externally—and more limited rack compatibility. It works with select Thule rack systems and available adapters, so check compatibility rather than assuming it will fit another brand’s bars.
Pros:
- 18-cubic-foot storage and a listed 165-pound capacity
- Designed to carry skis up to 200 cm and snowboards
- PowerClick mounting indicator and SlideLock system
- Opening features include a wide handle and lid pull straps
Cons:
- Compatibility is limited to select Thule rack systems and adapters
- Large external dimensions may not suit every vehicle or garage
Verdict: The Motion 3 XL is a compelling choice for travelers who need roomy storage or ski-length capacity and have a compatible rack.
munirater 14-Cubic-Foot Box: Two-Sided Loading and a Compact Footprint
The munirater box is listed at 14 cubic feet, with external dimensions of 56.3 × 25.98 × 16.14 inches. Its dual-side opening can be handy if you need to load from whichever side is safer or easier to reach. The listing also describes mechanical arms that hold the lid open until you close it, along with two locks and keys.
Its stated dimensions are shorter and narrower than the Thule Motion 3 XL, which may suit travelers who do not need to carry especially long items. However, the product details do not provide a maximum load capacity or specific crossbar spacing. They also recommend professional installation and do not include installation instructions. Those gaps make it especially important to confirm rack compatibility and loading limits before a long drive.
Pros:
- 14-cubic-foot capacity with dual-side opening
- Listed dimensions help you compare its footprint with your roof space
- Mechanical arms support the lid while it is open
- Includes two locks and keys
Cons:
- No maximum load capacity is listed in the supplied details
- Installation instructions are not included
Verdict: Consider this box if its dimensions and two-sided access fit your needs, but get clear answers about load limits and rack compatibility first.
INNO Wedge 660: Low-Profile Storage for Ski Trips
The INNO Wedge 660 trades some storage volume for a low-profile, wedge-shaped design. It has 11 cubic feet of capacity and opens from either side. The product information lists room for up to four snowboards or six to eight pairs of skis, making it a focused option for winter trips rather than a high-volume luggage carrier.
INNO’s Memory Mount system is designed to make later installation and removal easier after the initial setup. The listing also describes SPM injection construction and a safety lock that prevents the key from being removed until the box is secured. Its low profile is intended to help reduce wind noise, though actual noise can depend on the vehicle, rack, load, and driving conditions.
The smaller capacity is the main trade-off, especially for families packing bulky bags. The supplied details do not state a maximum load or provide box dimensions, so check those points and confirm rack fit before choosing it. The listing is marked unavailable in the supplied product information, so confirm its current status as well.
Pros:
- Low-profile wedge design with dual-side access
- Listed capacity for skis and snowboards
- Memory Mount system is designed to simplify repeat installation
- Locking system is designed to confirm the box is secured
Cons:
- 11-cubic-foot capacity is smaller than the other boxes here
- Listing is marked unavailable, and the supplied details do not state a maximum load
Verdict: The Wedge 660 makes the most sense for ski-focused travelers who prefer a lower-profile box and can confirm its availability and rack fit.
How to Choose a Roof Cargo Box for Long Trips
Match the box to your kind of cargo
Start with what you plan to carry. Luggage and camping gear often benefit from a roomy interior, while skis and snowboards need enough internal length. The Thule Motion 3 XL lists an 80-inch internal length and capacity for skis up to 200 cm. The INNO Wedge 660 lists less total volume but is designed around winter sports gear. Measure long items before you shop, and compare those measurements with the box’s internal dimensions.
Check roof-rack fit and roof-load limits
A box must fit both your crossbars and your vehicle’s roof. Confirm the box’s mounting system works with your rack, then check the vehicle and rack manuals for load limits. Include the weight of the box itself when calculating the total load on the roof. The box’s own maximum capacity is not permission to exceed the lower limit set by your car or rack.
Choose an opening style that suits your parking
A rear-opening box, such as the SportRack Vista XL, can help keep you away from traffic while loading. Dual-side designs let you reach the contents from either side, which is useful when another car, wall, or curb blocks one side. Think about where you expect to park and how often you will need to reach the box during the trip.
Compare storage volume with the space on your roof
A larger box can hold more, but its length and width also matter. Check the box dimensions against your roof and crossbar placement, and make sure the box will not interfere with opening the hatch. If garage clearance matters, account for the added height of the box and its contents. The Motion 3 XL’s listed external dimensions, for example, are 84.7 × 35 × 17 inches.
Consider mounting, locking, and lid support
Look for clear mounting instructions and hardware that suits your rack. Some options listed here include tool-free mounting, a torque indicator, or a system designed to simplify repeat installation. Locks help secure the box, but they do not replace careful packing and proper closure. Lid supports can also make loading easier by holding the lid open while you work.
Think about access and trip frequency
If you plan to open the box at many stops, easy access can matter as much as capacity. Dual-side openings offer flexibility, while rear access can be useful when loading beside traffic. If you will remove the box between trips, consider how its mounting system handles installation and removal, as well as where you will store it.
Frequently Asked Questions
How much weight can I put in a roof cargo box?
Follow the lowest limit among the box, roof rack, and vehicle roof. Add the box’s own weight when checking the vehicle’s roof-load limit. The models listed here specify different box capacities, and the munirater product details do not state one.
Are roof cargo boxes universal?
No. Even boxes described as universal need to match your crossbars and vehicle. Check the manufacturer’s fit information, bar spacing requirements, and mounting hardware before ordering. The Thule Motion 3 XL, for example, is listed as compatible with select Thule rack systems and available adapters.
Is a rear-opening box better than a dual-side box?
Neither style is best for every trip. Rear access can be useful when you want to load away from roadside traffic. Dual-side opening gives you a choice of sides when parking conditions make one side hard to reach.
Can I carry skis in any roof cargo box?
Not necessarily. Check the box’s internal length and its stated ski capacity. The Thule Motion 3 XL lists space for skis up to 200 cm, while the INNO Wedge 660 lists capacity for skis and snowboards but has less total storage volume.
Will a roof cargo box affect fuel use or driving?
A roof box changes the shape and load of your vehicle, so it can affect driving and fuel use. The Thule Motion 3 XL and INNO Wedge 660 listings describe aerodynamic designs, but they do not provide a specific fuel-saving amount. Secure the box correctly and follow your vehicle and rack instructions.
Which box is best for a family road trip?
If your rack is compatible, the Thule Motion 3 XL and SportRack Vista XL offer 18 cubic feet of listed capacity. The Thule includes a higher stated load limit and ski-length information; the SportRack has rear access and tool-free mounting hardware. Compare fit, availability, and the roof-load limit before deciding.
Final Recommendation
For a long trip that calls for generous storage and room for winter gear, the Thule Motion 3 XL stands out for its 18-cubic-foot capacity, listed ski length, and mounting and locking features—provided you have a compatible rack. If access from both sides is your priority, compare the 14-cubic-foot dual-opening options, but confirm their exact capacity, fit, and load limits. For any box, a careful fit check and respect for your vehicle’s roof-load limit matter more than storage volume alone.