A dual-side-opening roof cargo box can make road trips easier by letting you reach your gear from either side of the vehicle. The right choice depends on more than storage volume: check the box’s weight limit, your roof rack’s fit, and your vehicle’s roof-load rating before you buy. The five options below vary from compact models to a very large carrier, and their listed capacity and access details are not equally clear.
Quick Comparison
| Product | Listed capacity | Maximum load | Opening and fit notes |
|---|---|---|---|
| CNSLCJR 16 Cu Ft Hard Shell Cargo Box | 16 cu ft in title; 15.5 cu ft in description | 130 lb | Dual-side opening; crossbars up to 3 in wide |
| Runave 14 Cu Ft Hard Shell Cargo Box | 14 cu ft | 150 lb | Access from either side; crossbars under 3 in wide |
| Curtainboro Large Hard Shell Cargo Box | 17 cu ft in description; 19.4 cu ft in title | 165 lb | Dual-side opening; check rack fit and roof clearance |
| QUAWIP Gray 13 Cu Ft Cargo Box | 13 cu ft | 130 lb | Passenger-side opening is specified; crossbars up to 3 in wide |
| Relaxcabine 26 Cu Ft Extra-Large Cargo Box | 26 cu ft | 150 lb | Dual-side opening; tool-free installation listed |
Capacity note: The product information gives conflicting capacity figures for the CNSLCJR and Curtainboro boxes. Confirm the current listing details before choosing based on interior volume. The supplied product data also marks the QUAWIP as unavailable, so check its listing for current availability.
Our Picks: Best Roof Cargo Boxes With Dual Side Opening reviews
1. CNSLCJR 16 Cu Ft Hard Shell Cargo Box: A Practical Mid-Size Choice
This hard-shell box is a middle-ground option for family luggage, camping gear, or other bulky items that take up cabin space. Its title advertises 16 cubic feet, while the detailed description lists 15.5 cubic feet and dimensions of 58.3 by 35.4 by 13 inches. Treat the capacity as approximate until you confirm the listing specifications.
The shell uses ABS and PMMA, and the stated maximum load is 130 pounds. The listing describes a dual-side opening, support arms, and a lock designed so the key can be removed only when the latches are closed. It also lists tool-free installation and compatibility with round, square, and most aerodynamic crossbars up to 3 inches wide.
This could suit drivers who want a straightforward amount of extra storage without moving up to an extra-large carrier. One limitation is the capacity discrepancy, and the 130-pound box limit does not override the lower roof or rack limit your vehicle may have. Check the mounting-hole positions and crossbar setup before ordering.
Pros:
- Useful mid-size capacity for luggage and outdoor gear
- Tool-free installation is listed
- Support arms are designed to hold the lid open
- Locking system is designed to keep the key until the latches are closed
Cons:
- Capacity differs between the title and detailed description
- 130-pound maximum load may be limiting for heavier equipment
Verdict: Choose this CNSLCJR if its fit and verified capacity suit your needs and you want a hard-shell box with tool-free mounting.
2. Runave 14 Cu Ft Cargo Box: A Higher Listed Load Limit
The Runave offers 14 cubic feet of storage in a hard shell measuring 62.5 by 32.5 by 13 inches. Its listed maximum load of 150 pounds is higher than the CNSLCJR’s, though your vehicle’s roof and rack limits may be lower and should guide what you carry.
The ABS and PMMA construction is described as waterproof and UV-resistant. The dual-sided opening is intended to let you load and retrieve items from either side of the vehicle. The package is listed as including two keys, two straps, installation parts, and instructions, with no extra tools required.
This model may fit drivers who want a relatively long box with a higher stated load capacity than some smaller options. The fit information is specific: the rack is listed as 17.32 to 38.58 inches wide, and crossbars must be less than 3 inches wide. Check both measurements, along with bar spacing, before buying. The listing also advises locking one side before opening the other.
Pros:
- 14 cubic feet of storage in a long, low-profile shape
- 150-pound maximum load is listed
- Access is available from either side
- Installation parts and instructions are included
Cons:
- Crossbar width and rack width requirements need careful checking
- The listing instructs you to lock one side before opening the other
Verdict: The Runave is worth considering if its rack measurements match your vehicle and you value a 150-pound listed capacity in a 14-cubic-foot box.
3. Curtainboro Large Cargo Box: More Room and the Highest Listed Load Limit
The Curtainboro is aimed at travelers who need substantial room for suitcases, camping equipment, or other gear that crowds the cabin. Its title gives a capacity of 19.4 cubic feet, but the description says 17 cubic feet. The listed 165-pound load limit is the highest among these five options, but the conflicting volume figures make it important to verify the current product specifications.
The box is described as a hard-shell carrier made with waterproof ABS material. Its dual-side opening is intended to make loading and retrieving items easier when the vehicle is parked on either side of the box. A built-in lock, two keys, and secure straps are also included according to the product information.
This could be a better match than the smaller models if you need extra room and your vehicle can safely carry the box and its contents. However, the supplied details do not give the box’s dimensions or a precise crossbar fit range. Check the rack spacing, roof clearance, and vehicle roof-load rating before you commit.
Pros:
- More listed capacity than the 13- and 14-cubic-foot options
- 165-pound maximum load is specified
- Dual-side access can be convenient in tight parking spots
- Includes a locking system, keys, and straps according to the listing
Cons:
- Capacity differs between the title and description
- Dimensions and specific crossbar measurements are not provided in the supplied details
Verdict: Consider the Curtainboro for its larger stated capacity and load limit, but confirm its true volume and fit details before choosing it over a better-documented box.
4. QUAWIP Gray 13 Cu Ft Cargo Box: Compact Storage With a Fit Checklist
The QUAWIP is the smallest listed option here, with 13 cubic feet of storage and a 130-pound maximum load. Its ABS and PMMA shell is described as suitable for protecting luggage and camping equipment from the elements. The gray finish also gives it a different look from the other listed models.
There is an important detail to verify: although the product title calls this a dual-side-opening box, the description says it opens on the passenger side. It also refers to locking or unlocking either side. Confirm how the lid opens on the current listing if access from both sides is a deciding feature. The description gives a maximum crossbar width of 3 inches and a mounting-hole distance range of 13.38 to 22.24 inches.
The product data supplied for this article marks the box as unavailable, so check its listing before planning a purchase. If it is available, its smaller capacity may work for lighter packing or vehicles where a very large carrier is not practical. Avoid choosing it without checking those mounting measurements against your rack.
Pros:
- Compact 13-cubic-foot storage size
- 130-pound maximum load is specified
- Crossbar width and mounting-hole range are provided
- Includes a security lock system according to the listing
Cons:
- Opening details are not fully clear in the product description
- The supplied product data marks it as unavailable
Verdict: The QUAWIP may suit drivers who need a smaller box, but check its availability and confirm the opening design and mounting fit first.
5. Relaxcabine 26 Cu Ft Cargo Box: The Extra-Large Option
With 26 cubic feet of listed storage, the Relaxcabine has the largest stated capacity in this group. That makes it the most obvious option for bulky trip gear, but its 150-pound maximum load still applies. A large interior volume does not mean you can fill it with heavy items; follow the vehicle and roof-rack limits as well as the box limit.
The product information lists ABS and PC composite construction, a dual-side opening, and support arms that hold the lid open. It also describes tool-free installation and mounting brackets for most factory and aftermarket racks, including round, square, and aerodynamic bars. The central lock is designed so the keys can be removed only when all locking points are secured.
This box may suit families or outdoor travelers who prioritize space above all else. Its large size could be less convenient for vehicles with limited roof area or for owners who want a smaller, easier-to-manage carrier. The supplied details do not provide dimensions or a crossbar spacing range, so check the current fit guidance before ordering. The aerodynamic design is described as reducing wind noise and drag, but actual results can vary by vehicle and setup.
Pros:
- Largest listed capacity in this comparison at 26 cubic feet
- Dual-side access with support arms to hold the lid open
- Tool-free installation is listed
- Central locking system is designed to confirm all locking points are secured
Cons:
- Its extra-large size may not suit every vehicle or roof rack
- Dimensions and specific crossbar spacing details are not provided in the supplied information
Verdict: Choose the Relaxcabine if you need maximum listed volume and can confirm that its size and load limits work with your vehicle.
How to Choose a Roof Cargo Box With Dual-Side Opening
Match the box to your roof rack
Check your crossbar shape, width, spacing, and mounting position against the box’s fit requirements. “Universal fit” does not guarantee compatibility with every rack. Some of these options specify a maximum bar width or a mounting-hole range, while others give less detail. When the measurements are missing, confirm them with the seller before ordering.
Check your vehicle’s roof-load limit
Compare the cargo box’s maximum load with the roof-load limit in your vehicle manual and the limit for your roof rack. The safe carrying limit is governed by the lowest applicable rating. Remember that the weight of the box itself also uses part of the roof’s capacity, so do not treat the box’s maximum cargo load as the amount your vehicle can automatically carry.
Choose capacity for the gear you actually pack
A 13- or 14-cubic-foot box may be enough for suitcases and soft bags, while a larger option can provide more room for bulky equipment. Volume figures can be hard to compare when listings give conflicting numbers, as they do for the CNSLCJR and Curtainboro. Use verified dimensions and think about the shape of your gear, not just the stated cubic feet.
Consider where you will load and unload
Dual-side opening is useful when one side of your vehicle is blocked by a wall, another car, or a campsite setup. Check that the product description clearly confirms access from both sides. The QUAWIP description, for example, specifies passenger-side opening despite its dual-opening title, so it deserves extra verification if two-sided access is essential.
Look closely at the lock and lid support
Locking systems and support arms make loading easier and help keep the lid in position while you arrange gear. Follow the supplied instructions for closing and locking the box, and make sure all latches are secured before driving. A lock adds a layer of control, but it should not be treated as a reason to leave valuables unattended.
Account for clearance and vehicle use
Before choosing a long or extra-large carrier, consider how it will sit on your roof and whether it could affect access to a rear hatch. Check the vehicle’s roof clearance and the rack’s position. The product details do not provide complete dimensions for every option, so verify the measurements that matter for your vehicle.
Expect changes in driving behavior
A loaded roof box adds weight and changes the vehicle’s profile. Secure the cargo so it cannot shift, close and lock the box fully, and follow the vehicle and rack instructions. Even when a product is described as aerodynamic, wind noise and fuel use can vary with the car, box position, speed, and load.
Frequently Asked Questions
What does dual-side opening mean?
It generally means the lid can be opened for access from either side of the vehicle. Check the specific product details, because some listings describe the opening mechanism less clearly than others.
Can I use one of these boxes on any car?
No. Your car needs a compatible roof rack, and the box must fit the rack’s bar shape, width, spacing, and mounting points. You also need to stay within the vehicle’s roof-load limit.
Which box has the most storage space?
The Relaxcabine lists 26 cubic feet, the largest stated capacity in this comparison. Confirm its dimensions and rack fit before buying, since the supplied product details do not include those measurements.
Which option has the highest listed load limit?
The Curtainboro lists a 165-pound maximum load. The vehicle or roof rack may have a lower limit, which takes priority. Its capacity is also inconsistent between the title and description, so verify the current listing.
Are these roof boxes waterproof?
Some product descriptions claim waterproof or weather-resistant protection, but the supplied information does not give a common test standard for comparing them. Pack items that must stay dry in suitable bags, and check the product instructions for care and use details.
Do I need tools to install a roof cargo box?
The CNSLCJR, Runave, and Relaxcabine listings specify tool-free installation. Installation details vary by product, so read the included instructions and confirm that the mounting hardware matches your rack.
Can I fill the box to its listed weight limit?
Only if the vehicle and roof rack can safely support the box and its contents. Account for the box’s own weight and follow the lowest limit given by your vehicle, rack, or cargo box manufacturer.
Final Recommendation
For the most storage, the Relaxcabine stands out with its listed 26-cubic-foot capacity, provided its large size fits your vehicle. The Runave offers a more moderate 14-cubic-foot volume with a 150-pound listed load limit and clearly described access from either side. If you prefer a mid-size option, consider the CNSLCJR after confirming its conflicting capacity figures. For any of these boxes, verify rack compatibility and roof-load limits before ordering.