110 Lb vs 150 Lb Roof Cargo Boxes: Which Should You Buy?
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Choosing between an 110 lb vs 150 lb roof cargo box depends on your gear weight and vehicle setup. Both units offer lockable storage to keep items secure and weather-resistant. The DNA Motoring model provides 11 cubic feet of space with a 110 lb load limit. The Relaxcabine unit offers 14 cubic feet and supports up to 150 lbs. You need to weigh volume needs against weight limits.
Key differences
| Aspect | DNA Motoring 11 cu ft Roof Box | Relaxcabine 14 cu ft Hard Shell Roof Box |
|---|---|---|
| Load Capacity | 110 lbs | 150 lbs |
| Capacity | 11 cu. ft. | 14 cu. ft. |
| Shell Type | ABS | ABS + PMMA |
| Opening | Side | Dual-side |
| Vehicle Compatibility | Cross bars only | Round, square, most aero crossbars |
Which one should you choose?
Choose DNA Motoring 11 cu ft Roof Box if
- You primarily carry lighter loads under 110 lbs
- Your vehicle only has standard cross bars
- You prefer a shorter box length at 53 inches
Choose Relaxcabine 14 cu ft Hard Shell Roof Box if
- You need to haul heavier gear up to 150 lbs
- You want dual-side access for easier loading
- You have round or aerodynamic cross bars
Verdict: The DNA Motoring box suits drivers with standard cross bars and lighter loads. The Relaxcabine unit is better for those needing more volume and higher weight limits. Your choice depends on your specific bar type and gear weight.
110 lb vs 150 lb Load Capacity
Load Capacity
The DNA Motoring 11 cu ft Roof Box supports a maximum load of 110 lbs when weight is evenly distributed. This limit applies to the rugged ABS shell construction. In contrast, the Relaxcabine 14 cu ft Hard Shell Roof Box handles up to 150 lbs. This 40 lb difference matters if you carry heavy camping gear, luggage, or sports equipment. Both boxes require you to distribute weight evenly to maintain structural integrity and safety during travel. The higher limit on the Relaxcabine model offers more flexibility for heavier loads.
Capacity
Internal volume determines how much bulky gear fits inside. The DNA Motoring unit offers 11 cubic feet of storage space. It measures 53 inches long, 34 inches wide, and 15 inches high. The Relaxcabine box provides 14 cubic feet of space. Its dimensions are 62.5 inches long, 32.48 inches wide, and 13.19 inches high. The extra three cubic feet in the Relaxcabine model allows for more items or larger pieces of equipment. You should measure your gear against these internal volumes before deciding which size fits your needs.
Opening
Access design affects how easily you load and unload items. The DNA Motoring box opens from the side only. It opens up to 14 inches wide, which helps with bulky items. The Relaxcabine model features a dual-side opening design. It includes a wide 15-inch passenger-side opening, allowing access from either side of the vehicle. This flexibility is useful when parking in tight spaces. Both units keep the lid open with support arms while you load gear. The dual-side feature on the Relaxcabine adds convenience.
Shell Type
Material choice impacts durability and weather protection. The DNA Motoring cargo box is constructed from rugged, impact-resistant ABS material. It features a black textured finish. The Relaxcabine box uses a combination of premium ABS and PMMA materials. This creates a hard shell with a glossy exterior that withstands sun, rain, and harsh outdoor conditions. The PMMA layer may offer additional clarity or impact resistance compared to standard ABS. Both designs aim to protect contents from inclement weather and road debris during transport.
Vehicle Compatibility
Mounting requirements vary between the two units. The DNA Motoring box fits vehicles with cross bars only. It requires no tool assembly for installation. The Relaxcabine model is compatible with round, square, and most aerodynamic crossbars. It also installs quickly with a tool-free mounting system. The Relaxcabine unit offers broader compatibility with different roof rack styles. If your vehicle has only specific cross bars, check the DNA Motoring listing. The Relaxcabine design provides more options for various roof rack setups.
Which roof cargo box fits your needs?
You need max load for heavy gear
The Relaxcabine unit supports up to 150 lbs, offering 37% more capacity than the 110 lb limit. Its 14 cubic feet of internal volume accommodates bulky camping equipment and luggage. The dual-side opening design allows quick access from either side of the vehicle, which is practical when parking in tight spaces.
You prefer a compact, lightweight option
The DNA Motoring box weighs less and measures 53 inches long, making it suitable for smaller vehicles or lower roof profiles. Its 11 cubic feet capacity handles moderate storage needs. The textured black ABS shell provides durability, and the single-side opening mechanism keeps the profile low while securing items with a key lock system.
You want versatile crossbar compatibility
This model fits round, square, and most aerodynamic crossbars, offering greater flexibility than the DNA Motoring unit which requires crossbars only. The tool-free installation system allows you to attach or remove the box in minutes. The glossy ABS plus PMMA exterior withstands sun and rain, protecting your belongings during long-distance travel.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | DNA Motoring 11 cu ft Roof Box | drivers needing moderate 110 lb capacity | Check price of DNA Motoring 11 cu ft Roof Box on Amazon |
| 2 | Relaxcabine 14 cu ft Hard Shell Roof Box | Dual-side access and 150 lb loads | Check price of Relaxcabine 14 cu ft Hard Shell Roof Box on Amazon |
The products compared
DNA Motoring 11 cu ft Roof Box
Best for: drivers needing moderate 110 lb capacity
- Load Capacity
- 110 lb (what this guide is about)
- Capacity
- 11 cu. ft.
- Shell Type
- ABS
- Opening
- side
- Security
- key and lock
- Installation
- no tool assembly
View on Amazon: DNA Motoring 11 cu ft Roof Box Affiliate link
This DNA Motoring carrier offers 11 cubic feet of volume and supports up to 110 pounds. It measures 53 inches long and 34 inches wide, fitting vehicles with crossbars. The ABS shell is textured black and lockable. It opens from the side for easier access. This model suits drivers who prioritize a lower weight limit and a standard footprint over high-capacity hauling.
Pros
- 110 lb maximum load capacity
- 11 cubic feet internal storage
- Side-opening lid for access
- Key and lock security system
- Tool-free installation on crossbars
Cons
- 110 lb limit is lower than 150 lb alternatives
- 11 cu. ft. volume is smaller than larger options
- Fixed 34-inch width may not fit all roof racks
Good fit if
- You need a lighter load limit for smaller loads
- You have standard crossbars and need a 53-inch length
- You want a lockable ABS carrier with side access
Skip if
- You require a 150 lb load capacity
- You need more than 11 cubic feet of space
- Your roof rack width is narrower than 34 inches
Verdict: DNA Motoring 110 lb Roof Cargo Box is a practical option for those who do not need the higher 150 lb capacity of other models on this list. It fits buyers who prioritize a moderate footprint and secure, side-access storage over maximum volume.
Relaxcabine 14 cu ft Hard Shell Roof Box
Best for: Dual-side access and 150 lb loads
- Load Capacity
- 150 lb (what this guide is about)
- Capacity
- 14 cu ft
- Shell Type
- ABS + PMMA
- Opening
- Dual-side
- Water Resistance
- Waterproof
- Security
- Key lock
View on Amazon: Relaxcabine 14 cu ft Hard Shell Roof Box Affiliate link
This Relaxcabine cargo box offers 14 cubic feet of volume and supports a 150 lb load. Its dual-side opening allows access from either side of your vehicle. The hard ABS and PMMA shell resists weather and impacts. It mounts tool-free on round, square, or aerodynamic crossbars. The key lock secures contents at multiple points. You get 62.5 inches of length for bulky gear.
Pros
- 150 lb load capacity
- Dual-side opening design
- Tool-free installation
- ABS + PMMA hard shell
- Key lock security
Cons
- 30.2 lb weight adds vehicle load
- 14 cu ft capacity is mid-range
- No mention of aerodynamic drag reduction
Good fit if
- You need to access gear from the passenger side
- You carry heavy loads up to 150 lbs
- You have round or square crossbars
Skip if
- You require more than 150 lbs capacity
- You prefer a single-side opening
- You need a larger than 14 cu ft volume
Verdict: Relaxcabine 14 Cu Ft Dual-Side Roof Box fits travelers who prioritize easy access and heavy loads. It handles 150 lbs securely with dual-side entry. It suits families with standard crossbars.
Specifications side by side
| Spec | DNA Motoring 11 cu ft Roof Box | Relaxcabine 14 cu ft Hard Shell Roof Box |
|---|---|---|
| Capacity | 11 cu. ft. | 14 cu ft |
| Shell Type | ABS | ABS + PMMA |
| Opening | side | Dual-side |
| Load Capacity | 110 lbs | 150 lb |
| Water Resistance | not stated | Waterproof |
| Security | key and lock | Key lock |
| Installation | no tool assembly | Tool-free |
| Vehicle Compatibility | fits vehicles with cross bars only | Round, square, most aero crossbars |
| Dimensions | 53" L x 34" W x 15" H | 62.5 x 32.48 x 13.19 in |
| Recommended Use | not stated | Luggage, gear, camping equipment |
| Vehicle Type | Car | not stated |
| Mount Type | Roof Mount | not stated |
| Lockable | Lockable | Lockable |
| Weight | not stated | 30.2 pounds |
| Size | 11 cu. ft. | 14 Cu Ft White |
| Color | Textured Black | White |
| Model | PT-ZTL-8166-BK | Cargo Box 14 Cu Ft White |
Frequently asked questions
Can I put 120 pounds in the 110 lb roof box?
No, you should not exceed the stated limit. The DNA Motoring model supports a maximum of 110 pounds when weight is evenly distributed. Overloading can damage the ABS shell and compromise safety. Stick to the 110 lb spec for secure travel.
Which box handles heavier loads better?
The Relaxcabine unit handles heavier loads better. It supports up to 150 pounds, offering 37% more capacity than the 110 lb limit. This makes it suitable for bulky camping equipment and luggage that exceeds the lighter model's threshold.
Do both boxes lock securely?
Yes, both models are lockable. The DNA Motoring box features lockable storage to keep items secure. The Relaxcabine unit is also lockable, ensuring your gear remains protected from theft and weather while you travel on the road.
Which model is better for side access?
The Relaxcabine box is better for side access. It features dual-side opening, allowing easy entry from either side of the vehicle. This is useful if you park in tight spaces where one side is blocked by other cars or walls.
What is the size difference between these two?
The Relaxcabine is larger in both volume and length. It offers 14 cubic feet and measures 62.5 inches long. The DNA Motoring box provides 11 cubic feet and measures 53 inches long. Choose based on your available roof space and gear volume.
Are these compatible with standard roof racks?
Both are designed for roof mount systems. The DNA Motoring model is listed for car use with a roof mount. The Relaxcabine unit suits families with standard crossbars. Ensure your vehicle has compatible bars before purchasing either option for safe installation.