Hard Shell vs Soft Shell Roof Cargo Boxes: Which Should You Buy?
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When choosing a hard shell vs soft shell roof cargo box, you need to weigh storage needs against vehicle compatibility. Both options expand your carrying space, but they differ in construction and installation. The hard shell offers rigid protection and a locking system, while the soft shell provides flexible, strap-based mounting. This guide compares their key specifications to help you decide which style fits your vehicle and travel habits best.
Key differences
| Aspect | Maxsa Innovations 17 cu ft Hard Shell Cargo Box | Sailnovo 21 cu ft Soft Roof Bag |
|---|---|---|
| Shell Type | Hard shell | Soft shell |
| Capacity | 17 cu ft | 21 cu ft |
| Load Capacity | 165 lbs | not listed |
| Water Resistance | not listed | Waterproof |
| Security | Locking system with two keys | not listed |
| Mount Type | Roof Mount | Tie-Down Strap |
Which one should you choose?
Choose Maxsa Innovations 17 cu ft Hard Shell Cargo Box if
- You need a secure, locked storage solution for valuable gear.
- You prefer a rigid, aerodynamic shape that reduces wind noise.
- You want a defined capacity of 17 cubic feet with a 165 lbs limit.
Choose Sailnovo 21 cu ft Soft Roof Bag if
- You require extra volume with a 21 cubic feet capacity.
- You need a waterproof bag that fits vehicles without roof racks.
- You want a lightweight option at 8.16 pounds for easy storage.
Verdict: Choose the hard shell if you prioritize security, aerodynamic efficiency, and a defined weight limit for standard roof racks. Opt for the soft shell if you need maximum capacity, waterproof protection, and flexible mounting on vehicles without traditional crossbars.
Hard vs Soft Roof Box Specs
Shell Type
The Maxsa Innovations features a rigid hard shell construction, providing a solid barrier against impacts and debris. This design offers structural integrity that protects your gear from external forces. In contrast, the Sailnovo utilizes a soft shell design made from flexible materials. This approach allows the bag to conform to your roof rack and any items already on it. The hard shell is a fixed, durable container, while the soft shell is a adaptable, fabric-based carrier. You choose between rigid protection and flexible utility based on your specific cargo needs.
Capacity
Storage volume is a key differentiator for roof cargo solutions. The Maxsa Innovations provides 17 cubic feet of interior space. This volume is suitable for families needing moderate luggage or outdoor gear for weekend trips. The Sailnovo offers a larger 21 cubic feet of capacity. This extra space allows you to carry more bulkier items or pack more thoroughly for longer journeys. If maximizing storage volume is your priority, the soft shell bag provides four additional cubic feet. This difference can be significant when planning extensive travel or moving large equipment.
Load Capacity
Weight limits determine how much gear you can safely transport. The Maxsa Innovations hard shell supports a load capacity of 165 pounds. This robust rating allows you to pack heavy items like tools, sports equipment, or dense luggage without exceeding safety standards. The Sailnovo soft shell does not list a specific weight capacity in its published specifications. Without this data, you cannot verify if it matches the hard shell's strength. For heavy loads, the hard shell offers a clear, verified limit, ensuring you stay within safe towing and roof rack parameters.
Water Resistance
Protection from the elements is crucial for cargo safety. The Sailnovo soft shell is explicitly described as waterproof. This feature ensures your belongings remain dry even in heavy rain or snow. The Maxsa Innovations hard shell does not have a specific water resistance rating listed in its data. While hard shells generally offer good protection, the lack of a stated waterproof rating means you should verify seal quality separately. For guaranteed dry storage in wet conditions, the soft shell's waterproof claim provides a distinct advantage for outdoor enthusiasts.
Security
Theft prevention is a major concern for roof-mounted storage. The Maxsa Innovations hard shell includes a secure locking system with two keys. This mechanism prevents unauthorized access to your cargo while you are away. The Sailnovo soft shell does not mention a built-in locking system in its specifications. You would likely need to use separate locks or straps to secure the soft shell. For peace of mind regarding theft, the hard shell's integrated locking feature offers a superior level of security compared to the unsecured soft shell design.
Choose Your Roof Cargo Box
Families needing secure, rigid storage
The Maxsa Innovations hard shell offers 17 cubic feet of space and a 165 lbs load capacity. Its rigid construction and locking system protect gear from theft and weather. You get peace of mind with two included keys and robust straps, making it ideal for long road trips where security matters.
Budget buyers wanting maximum volume
The Sailnovo soft shell provides 21 cubic feet of capacity, which is larger than the hard shell option. It is also significantly lighter at 8.16 pounds. This makes it easier to handle and install using simple tie-down straps. You get more storage space for your gear without the weight penalty.
Travelers prioritizing aerodynamic efficiency
The Maxsa Innovations features an aerodynamic design that cuts wind resistance and noise. This shape improves fuel efficiency and creates a quieter ride. You benefit from a smoother journey compared to soft bags. The rigid structure also ensures your luggage stays organized and protected during high-speed highway driving.
Those with limited roof space
The Sailnovo soft bag is compact when not in use, weighing only 8.16 pounds. It fits cars without dedicated racks using tie-down straps. You can store it easily when not needed. The waterproof material protects contents from rain. This option suits you if you need flexible storage that does not require permanent mounting hardware.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Maxsa Innovations 17 cu ft Hard Shell Cargo Box | Standard road trips needing locked, aerodynamic storage | Check price of Maxsa Innovations 17 cu ft Hard Shell Cargo Box on Amazon |
| 2 | Sailnovo 21 cu ft Soft Roof Bag | cars without roof rails | Check price of Sailnovo 21 cu ft Soft Roof Bag on Amazon |
The products compared
Maxsa Innovations 17 cu ft Hard Shell Cargo Box
Best for: Standard road trips needing locked, aerodynamic storage
- Shell Type
- Hard Shell (what this guide is about)
- Capacity
- 17 cu ft
- Opening
- Dual-side
- Load Capacity
- 165 lbs
- 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 hard shell roof box offers 17 cubic feet of storage and supports up to 165 lbs. Its aerodynamic design reduces wind noise and drag. The unit measures 55.1 inches long and weighs 35.3 pounds. It includes a locking system with two keys for security. This carrier fits most cars and SUVs with roof racks. It suits travelers needing secure, weather-protected gear space.
Pros
- 17 cubic feet capacity for luggage and gear
- 165 lbs load capacity for heavy items
- Aerodynamic shape reduces wind resistance and noise
- Includes locking system with two keys
Cons
- 17 cubic feet is smaller than the 21 cubic feet alternative
- 35.3 pound weight adds significant vehicle weight
- Only one color option available
Good fit if
- You need a secure, locked storage solution for road trips
- You drive a car or SUV with standard roof racks
- You prioritize aerodynamic efficiency to maintain fuel economy
Skip if
- You require more than 17 cubic feet of storage space
- You need to carry loads exceeding 165 lbs
- You prefer a lighter carrier for easier handling
Verdict: Maxsa Innovations 17 Cu Ft Hard Shell provides secure, aerodynamic storage for standard road trips. It fits buyers who value locked safety and moderate capacity over maximum volume.
Sailnovo 21 cu ft Soft Roof Bag
Best for: cars without roof rails
- Shell Type
- Soft Shell (what this guide is about)
- Capacity
- 21 cubic feet
- Water Resistance
- Waterproof
- Installation
- Tie-Down Strap
- Dimensions
- 9.84 x 7.09 x 13.8 in
- Vehicle Type
- Car
View on Amazon: Sailnovo 21 cu ft Soft Roof Bag Affiliate link
This Sailnovo roof bag offers 21 cubic feet of soft shell storage. It weighs 8.16 pounds and measures 9.84 by 7.09 by 13.8 inches. The bag uses tie-down straps for installation. It is waterproof and fits cars without roof rails. You get a flexible, low-profile option that packs away small.
Pros
- 21 cubic feet capacity
- Waterproof soft shell
- Fits cars without rails
- Lightweight at 8.16 pounds
Cons
- Soft shell offers less impact protection
- No rigid locking mechanism
- Lower profile than hard shell boxes
Good fit if
- You have a car without roof rails
- You need flexible, stowable storage
- You want a lightweight solution
Skip if
- You need maximum security
- You drive in heavy hail
- You want rigid impact protection
Verdict: Sailnovo 21 Cu Ft Soft Roof Bag is a lightweight, waterproof soft shell carrier for cars without rails. You should buy it if you need flexible storage that packs away small.
Specifications side by side
| Spec | Maxsa Innovations 17 cu ft Hard Shell Cargo Box | Sailnovo 21 cu ft Soft Roof Bag |
|---|---|---|
| Capacity | 17 cu ft | 21 cubic feet |
| Shell Type | Hard shell ABS | Soft Shell |
| Opening | Dual-side | not stated |
| Load Capacity | 165 lbs | not stated |
| Water Resistance | Waterproof | Waterproof |
| Installation | not stated | Tie-Down Strap |
| Vehicle Compatibility | Cars and SUVs with roof rack | not stated |
| Dimensions | 55.1 x 35 x 16.1 in | 9.84 x 7.09 x 13.8 in |
| Recommended Use | Luggage, outdoor gear | not stated |
| Vehicle Type | Car, SUV | Car |
| Size | 17 Cubic Feet | 21 Cubic Feet |
| Mount Type | Roof Mount | Roof Mount |
| Weight | 35.3 pounds | 8.16 pounds |
| Color | Black | Black |
| Model | bIi-QJmJN9FwtqXvOPt-w-cKQbKMo | Sailnovo5033-FR |
Frequently asked questions
Can I install a soft shell cargo box on a car without roof rails?
Yes, you can. The Sailnovo 21 cu ft Soft Roof Bag is designed specifically for cars without roof rails. It uses a roof mount system that secures directly to the vehicle body. This makes it a flexible option for vehicles lacking standard crossbars or side rails.
How much weight can a hard shell roof box hold?
The Maxsa Innovations 17 cu ft Hard Shell Cargo Box supports a load capacity of 165 lb. This limit ensures the structural integrity of the rigid shell remains intact during travel. You must distribute this weight evenly across the crossbars to maintain safety and stability while driving.
Which roof box is better for aerodynamics and fuel efficiency?
Hard shells generally offer better aerodynamics due to their rigid, streamlined shape. The Maxsa Innovations model features a fixed width of 35 inches and a length of 55.1 inches. This solid structure cuts through air more efficiently than soft bags, which can flap or deform at high speeds.
How do I store a soft shell cargo box when not in use?
Soft shell boxes are designed for compact storage. The Sailnovo bag folds down to dimensions of 7.09 inches by 13.8 inches by 9.84 inches. This small footprint allows you to keep it in a trunk or closet easily. It weighs only 8.16 pounds, making it lightweight to handle.
Is a hard shell cargo box heavy to lift onto the roof?
Hard shells are heavier due to their rigid construction materials. The Maxsa Innovations unit weighs 35.3 pounds. You should have assistance when lifting it onto your roof rack. The weight ensures durability but requires more effort to install and remove compared to lightweight soft alternatives.
What is the total storage volume of a 21 cu ft soft bag?
A 21 cu ft soft bag provides 21 cubic feet of storage space. The Sailnovo model offers this volume in a flexible container. You can adjust the shape slightly to fit irregular items. This capacity is larger than the 17 cubic feet offered by the hard shell option.