165 Lb vs 150 Lb Roof Cargo Boxes in 2026: Key Differences
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Choosing between a 165 lb vs 150 lb roof cargo box often comes down to your specific gear needs. Both the Maxsa Innovations and Relaxcabine units are hard shell carriers designed to secure luggage and outdoor equipment on your vehicle. They share key features like lockable lids and universal fitment for most cars and SUVs. The primary difference lies in their weight limits and internal volume. You need to decide if the extra capacity justifies the size.
Key differences
| Aspect | Maxsa Innovations 17 cu ft Hard Shell Cargo Box | Relaxcabine 14 cu ft Hard Shell Roof Box |
|---|---|---|
| Load Capacity | 165 lbs | 150 lbs |
| Capacity | 17 cu ft | 14 cu ft |
| Opening | Top opening | Dual-side opening |
| Weight | 35.3 pounds | 30.2 pounds |
| Shell Material | Hard shell | ABS + PMMA |
Which one should you choose?
Choose Maxsa Innovations 17 cu ft Hard Shell Cargo Box if
- You need to carry heavier loads up to 165 lbs
- You require more internal volume for bulky items
- You prefer a standard top-loading design
Choose Relaxcabine 14 cu ft Hard Shell Roof Box if
- You want easy access from the passenger side of the car
- You need a lighter unit that weighs less on your roof
- You prioritize a waterproof ABS + PMMA shell
Verdict: The Maxsa Innovations model suits those who prioritize maximum weight capacity and storage space. The Relaxcabine option is better for users who value dual-side access and a lighter overall footprint. Select the box that aligns with your most frequent packing habits.
165 Lb vs 150 Lb Roof Cargo Boxes
Load capacity
The Maxsa Innovations unit supports a maximum load of 165 lbs. The Relaxcabine model supports up to 150 lbs. This 15-pound difference matters if you carry heavy gear like camping equipment or bulky luggage. You can load the Maxsa slightly more densely. The Relaxcabine requires you to distribute weight carefully to stay under its limit. Both limits assume proper roof rack support. You should always check your vehicle’s roof rack weight rating as well. The higher limit gives you more margin for heavy items.
Capacity
Storage volume differs significantly between these two boxes. The Maxsa Innovations offers 17 cubic feet of space. The Relaxcabine provides 14 cubic feet. That is a 3 cubic foot difference. You gain more room for larger items like sleeping bags or suitcases with the Maxsa. The Relaxcabine is more compact. This size difference affects how much you can pack for a family trip. The Maxsa holds more gear overall. The Relaxcabine fits smaller loads better. Choose based on your typical packing volume.
Opening style
Access to your gear varies between these models. The Relaxcabine features a dual-side opening design. You can open the lid from either side of your vehicle. This allows quick loading from the passenger side without walking around the car. The Maxsa Innovations does not list a dual-side opening in its specifications. It likely opens from one side only. This makes the Relaxcabine more convenient for parking in tight spaces. You can access items faster from the curb side.
Dimensions
Physical size impacts fit on your roof rack. The Maxsa measures 55.1 inches in length, 35 inches in width, and 16.1 inches in height. The Relaxcabine is longer at 62.5 inches but narrower at 32.5 inches and shorter at 13.2 inches. The Relaxcabine extends further over your vehicle’s rear. This may affect rear window visibility or trunk access. The Maxsa is wider and taller. You need to check your specific vehicle’s roof dimensions. Both fit standard crossbars, but clearance varies.
Weight
The empty weight of the carrier affects fuel economy and handling. The Maxsa Innovations weighs 35.3 pounds. The Relaxcabine weighs 30.2 pounds. The Relaxcabine is lighter by about 5 pounds. A lighter box reduces the strain on your roof rack and may improve aerodynamics slightly. You save a small amount of effort when lifting the box onto your roof. The difference is noticeable but not drastic. Both are hard shell units, so the weight comes from the durable materials used.
Which Roof Box Fits Your Needs
Heavy gear travelers needing max capacity
You should choose the Maxsa Innovations unit if your primary concern is carrying weight. It supports a load capacity of 165 lbs, which is 15 lbs more than the competitor. This extra margin is useful for bulky camping equipment or multiple large suitcases. The 17 cubic feet of volume also provides ample space for extensive travel essentials without worrying about exceeding weight limits.
Users wanting easy side access
The Relaxcabine model is the better choice if you value convenience during loading. It features a dual-side opening design, allowing you to access cargo from either side of your vehicle. This is particularly helpful in tight parking spots. The tool-free installation system also simplifies setup, letting you attach or remove the box quickly without needing additional tools or complex procedures.
Drivers prioritizing lower roof weight
If you prefer a lighter unit on your roof, the Relaxcabine box weighs only 30.2 pounds. This is 5.1 pounds lighter than the Maxsa Innovations option, which weighs 35.3 pounds. A lighter roof box can contribute slightly to better fuel efficiency and reduced strain on your vehicle's roof rack system. The compact 14 cubic feet capacity is still sufficient for standard luggage and gear.
Shoppers seeking larger internal volume
Choose the Maxsa Innovations carrier if you need more internal storage space. It offers 17 cubic feet of capacity compared to the Relaxcabine's 14 cubic feet. This additional volume helps accommodate larger items or a greater quantity of smaller bags. The hard shell construction ensures your gear remains protected while providing the extra room needed for longer road trips or family vacations.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Maxsa Innovations 17 cu ft Hard Shell Cargo Box | High capacity storage on long roof racks | Check price of Maxsa Innovations 17 cu ft Hard Shell Cargo Box on Amazon |
| 2 | Relaxcabine 14 cu ft Hard Shell Roof Box | Dual-side access and moderate loads | Check price of Relaxcabine 14 cu ft Hard Shell Roof Box on Amazon |
The products compared
Maxsa Innovations 17 cu ft Hard Shell Cargo Box
Best for: High capacity storage on long roof racks
- Load Capacity
- 165 lb (what this guide is about)
- Capacity
- 17 cu ft
- Shell Type
- Hard shell ABS
- Opening
- Dual-side
- Water Resistance
- Waterproof
- Vehicle Compatibility
- Cars and SUVs with roof rack
View on Amazon: Maxsa Innovations 17 cu ft Hard Shell Cargo Box Affiliate link
This Maxsa Innovations cargo box offers 17 cubic feet of storage with a 165 lb load capacity. Its hard shell construction protects gear from weather. The aerodynamic design reduces wind noise and drag. It fits most cars and SUVs with roof racks. You get two keys for secure locking. The unit weighs 35.3 pounds and measures 55.1 inches long. It is a practical solution for families needing extra space on road trips.
Pros
- 165 lb weight capacity supports heavy loads
- 17 cubic feet of hard shell storage
- Aerodynamic shape reduces wind resistance and noise
- Includes two keys for secure locking
Cons
- 55.1 inch length may overhang shorter vehicles
- 35.3 pound weight adds roof load
- Only black color option available
Good fit if
- You need high weight capacity for gear
- You drive a vehicle with long roof racks
- You want a hard shell for weather protection
Skip if
- You have a compact car with short racks
- You need multiple color choices
- You prefer a lightweight soft bag
Verdict: Maxsa Innovations 17 Cu Ft Hard Shell provides robust storage and high weight limits for larger families. It suits drivers with long roof racks who prioritize capacity over compact dimensions.
Relaxcabine 14 cu ft Hard Shell Roof Box
Best for: Dual-side access and moderate 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 roof cargo box offers 14 cubic feet of space and a 150 lb load capacity. It features dual-side opening for easy access and tool-free installation. The ABS and PMMA shell provides impact resistance and waterproof protection. It fits round, square, or aerodynamic crossbars. This model suits families needing secure storage for luggage and camping gear during road trips.
Pros
- 150 lb load capacity supports heavy gear
- Dual-side opening with 15-inch passenger access
- Tool-free installation on most crossbar types
- ABS + PMMA shell resists weather and impact
Cons
- 14 cubic feet capacity is smaller than 165 Lb competitors
- 150 lb load limit is lower than 165 lb class
- Weighs 30.2 pounds, adding more vehicle weight
Good fit if
- You need dual-side access for quick loading
- You travel with moderate luggage and gear
- You use round, square, or aero crossbars
Skip if
- You require a 165 lb load capacity
- You need more than 14 cubic feet of space
- You prefer a lighter roof box under 30 lbs
Verdict: Relaxcabine 14 Cu Ft Hard Shell Roof Box is a secure option for drivers prioritizing dual-side access over maximum load capacity. It fits those with standard crossbars who do not need the higher weight limit of the 165 lb class.
Specifications side by side
| Spec | Maxsa Innovations 17 cu ft Hard Shell Cargo Box | Relaxcabine 14 cu ft Hard Shell Roof Box |
|---|---|---|
| Capacity | 17 cu ft | 14 cu ft |
| Shell Type | Hard shell ABS | ABS + PMMA |
| Opening | Dual-side | Dual-side |
| Load Capacity | 165 lbs | 150 lb |
| Water Resistance | Waterproof | Waterproof |
| Security | not stated | Key lock |
| Installation | not stated | Tool-free |
| Vehicle Compatibility | Cars and SUVs with roof rack | Round, square, most aero crossbars |
| Dimensions | 55.1 x 35 x 16.1 in | 62.5 x 32.48 x 13.19 in |
| Recommended Use | Luggage, outdoor gear | Luggage, gear, camping equipment |
| Vehicle Type | Car, SUV | not stated |
| Mount Type | Roof Mount | not stated |
| Lockable | not stated | Lockable |
| Weight | 35.3 pounds | 30.2 pounds |
| Size | 17 Cubic Feet | 14 Cu Ft White |
| Color | Black | White |
| Model | bIi-QJmJN9FwtqXvOPt-w-cKQbKMo | Cargo Box 14 Cu Ft White |
Frequently asked questions
Does the 15 lb weight difference matter for my car?
Yes, if you carry heavy gear. The Maxsa Innovations box holds 165 lbs, while the Relaxcabine holds 150 lbs. That 15 lb gap helps if you load camping equipment or bulky luggage. The 165 lb limit offers more margin for dense items without exceeding roof rack limits.
Which roof box is better for dual-side access?
The Relaxcabine model is designed for this. It features dual-side opening, allowing you to load gear from either side of the vehicle. The Maxsa Innovations unit does not list this feature. If you park in tight spaces, the dual access provides practical convenience.
How do the dimensions affect fitment on my roof rack?
Size matters for clearance. The Maxsa Innovations unit is 55.1 inches long and 35 inches wide. The Relaxcabine is longer at 62.5 inches but narrower at 32.5 inches. Check your roof rack crossbar spacing and vehicle width to ensure either model fits without interfering with doors or lights.
Is hard shell construction standard for these models?
Yes, both units use hard shell construction. This design protects your gear from weather and road debris. The Maxsa Innovations and Relaxcabine boxes both feature this durable shell type, ensuring your luggage remains secure and dry during travel, regardless of the load capacity difference.
Does the Relaxcabine box include a locking mechanism?
Yes, the Relaxcabine 14 Cu Ft model is lockable. This adds a layer of security for your stored items. The provided data does not specify locking details for the Maxsa Innovations unit. If security is a priority, the lockable feature on the Relaxcabine is a key advantage.
Which box is lighter to install and remove?
The Relaxcabine model is lighter. It weighs 30.2 pounds, compared to the Maxsa Innovations unit at 35.3 pounds. If you frequently remove the box for storage or use a shorter roof rack, the lighter weight makes handling easier. The 5 lb difference is noticeable during installation.
Can I fit more volume in the 165 lb box?
Not necessarily by weight alone. The Maxsa Innovations offers 17 cubic feet of space. The Relaxcabine provides 14 cubic feet. While the 165 lb box allows more weight, it also offers more volume. Choose based on whether you need more bulk capacity or just higher weight tolerance.