30 Cubic Feet vs 11 Cubic Feet Roof Cargo Boxes: Which Should You Buy?
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Choosing between a 30 Cubic Feet vs 11 Cubic Feet roof cargo box depends on your storage needs and vehicle setup. Both options expand your carrying capacity and mount to your roof. The main difference lies in volume and construction. One offers a soft, waterproof bag with massive space. The other provides a hard, lockable shell for smaller loads. You must decide which fits your gear and vehicle best.
Key differences
| Aspect | FIVKLEMNZ 30 Cubic Feet Roof Bag | DNA Motoring 11 cu ft Roof Box |
|---|---|---|
| Capacity | 30 Cubic Feet | 11 Cubic Feet |
| Shell Type | 840D PVC | ABS |
| Dimensions | 60 x 43 x 20 inches | 53 x 34 x 15 inches |
| Load Capacity | not listed | 110 lbs |
| Security | Luggage lock included | Key and lock |
| Vehicle Compatibility | With or without rack | Cross bars only |
Which one should you choose?
Choose FIVKLEMNZ 30 Cubic Feet Roof Bag if
- You need maximum storage volume for large items like tents or multiple suitcases.
- Your vehicle lacks roof racks and you need a system that works without them.
- You prioritize a waterproof, flexible soft shell that conforms to your cargo.
Choose DNA Motoring 11 cu ft Roof Box if
- You want a rigid, impact-resistant ABS shell for durable protection.
- You require a secure, lockable hard case to keep valuables safe.
- You have roof crossbars and prefer a lower-profile, aerodynamic design.
Verdict: The 30 Cubic Feet bag suits those needing vast, flexible storage and rack-less installation. The 11 Cubic Feet box is better for secure, weather-resistant transport on vehicles with crossbars. Your choice depends on whether you prioritize volume or security.
30 Cubic Feet vs 11 Cubic Feet
Capacity
The FIVKLEMNZ 30 Cubic Feet Roof Bag offers significantly more volume than the DNA Motoring 11 cu ft Roof Box. You get nearly three times the storage space with the soft bag, which measures 60 x 43 x 20 inches. This allows you to fit 7-9 suitcases, tents, or large travel gear. The DNA Motoring unit provides 11 cubic feet of internal storage with dimensions of 53 x 34 x 15 inches. If you are planning a long road trip or moving large items, the 30 cubic feet option gives you the room you need. The smaller box is better for lighter loads or shorter trips where space is less critical. For maximum cargo volume, the larger soft bag is the clear choice.
Shell Type
Construction materials differ greatly between these two carriers. The FIVKLEMNZ uses 840D PVC material with high-frequency welded seams and a double-layered waterproof cover. This soft shell is flexible and designed to conform to your roof rack. The DNA Motoring box is built from rugged, impact-resistant ABS plastic with a textured black finish. This hard shell provides a rigid structure that protects contents from weather and physical impacts. Hard plastic boxes often offer better aerodynamics and security against break-ins compared to soft fabric bags. If you prefer a durable, rigid container that maintains its shape, the ABS model is superior. For a flexible, waterproof option that can be compressed, the PVC bag wins.
Water Resistance
Water protection is a key difference in this comparison. The FIVKLEMNZ bag is rated as 100% waterproof due to its upgraded 840D PVC material and welded seams. It features a double-layered cover to keep luggage dry in heavy rain or snow. The DNA Motoring box is described as protecting contents from inclement weather using its ABS construction, but it does not explicitly state a 100% waterproof rating. Hard boxes generally seal well, but soft bags with welded seams are often marketed specifically for total water exclusion. If keeping your gear completely dry in severe weather is your top priority, the FIVKLEMNZ bag provides a certified waterproof solution. The DNA Motoring box offers good weather protection but lacks the explicit waterproof guarantee.
Security
Security features vary between the two options. The DNA Motoring box includes a key and lock system to secure valuables and ensure proper lid alignment. This hard shell box prevents easy access to your cargo, offering peace of mind during stops. The FIVKLEMNZ bag comes with a luggage lock, but its soft PVC construction is more vulnerable to cutting or forced entry compared to rigid ABS plastic. Additionally, the DNA Motoring box has a secure locking mechanism that keeps the lid firmly closed. If theft prevention is your primary concern, the hard-sided DNA Motoring box is the safer choice. The soft bag relies more on the lock and straps but does not offer the same level of physical protection against tampering.
Compatibility
Vehicle compatibility differs significantly. The FIVKLEMNZ 30 Cubic Feet Roof Bag fits all vehicles, including those with side rails, crossbars, or no rack at all. It uses 10 reinforced straps and 6 door hooks for installation, making it highly versatile. The DNA Motoring box fits vehicles with crossbars only and requires no tool assembly. It is not compatible with side rails or rack-less setups. If you drive a car without a roof rack, the FIVKLEMNZ bag is your only option. For vehicles with existing crossbars, the DNA Motoring box is easy to install. The soft bag offers broader compatibility, while the hard box is limited to crossbar-equipped vehicles.
Which roof carrier suits your needs
Family hauling large gear
You need the 30 cubic feet of volume to fit seven to nine suitcases or camping gear. The 60 by 43 by 20 inch dimensions provide ample space. The 840D PVC material is fully waterproof. This soft bag keeps your luggage dry in heavy rain or snow during long road trips.
Driver with crossbars only
This box fits vehicles with crossbars only. It offers 11 cubic feet of storage with a 110 lb load capacity. The ABS shell is impact-resistant. You can open the lid from the side for easy access. The key lock secures your valuables while you drive on the highway.
Owner without roof rack
The soft bag works with cars, SUVs, vans, and trucks without a rack. It uses ten reinforced straps and six door hooks for stability. The anti-slip mat prevents scratches. You get a complete kit for quick installation. This flexible mount type adapts to your vehicle's specific shape and size.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | FIVKLEMNZ 30 Cubic Feet Roof Bag | Large loads on vehicles without roof racks | Check price of FIVKLEMNZ 30 Cubic Feet Roof Bag on Amazon |
| 2 | DNA Motoring 11 cu ft Roof Box | Drivers with cross bars needing moderate storage | Check price of DNA Motoring 11 cu ft Roof Box on Amazon |
The products compared
FIVKLEMNZ 30 Cubic Feet Roof Bag
Best for: Large loads on vehicles without roof racks
- Capacity
- 30 Cubic Feet (what this guide is about)
- Shell Type
- 840D PVC soft bag
- Water Resistance
- 100% waterproof
- Security
- Luggage lock
- Installation
- Straps and door hooks
- Vehicle Compatibility
- With or without roof rack
View on Amazon: FIVKLEMNZ 30 Cubic Feet Roof Bag Affiliate link
This soft-sided cargo carrier offers 30 cubic feet of storage, measuring 60 by 43 by 20 inches. It weighs 12 pounds and uses 840D PVC material for waterproof protection. The design includes 10 reinforced straps and 6 door hooks for secure mounting. You can use it on vehicles with or without roof racks. This bag frees up interior space for families or travelers needing extra room.
Pros
- 30 cubic feet capacity holds 7-9 suitcases
- 100% waterproof 840D PVC construction
- 10 reinforced straps and 6 door hooks
- Fits vehicles without roof racks
- Includes anti-slip mat and luggage lock
Cons
- Soft shell offers less aerodynamic efficiency than hard shells
- Dimensions may overhang smaller vehicle roofs
- Strap-based installation requires more time than rigid mounts
Good fit if
- You need maximum storage volume for long trips
- Your vehicle lacks a permanent roof rack
- You want to keep interior cabin space clear
Skip if
- You prioritize fuel efficiency from aerodynamic designs
- You want a rigid shell for high-speed stability
- You drive a compact car with a small roof
Verdict: FIVKLEMNZ 30 CuF Soft Roof Bag provides ample space for large loads on vehicles without racks. It suits travelers who need flexible storage and waterproof protection over aerodynamic performance.
DNA Motoring 11 cu ft Roof Box
Best for: Drivers with cross bars needing moderate storage
- Capacity
- 11 Cubic Feet (what this guide is about)
- Shell Type
- ABS
- Opening
- side
- Load Capacity
- 110 lbs
- 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 storage for vehicles with cross bars. It measures 53 inches long and holds up to 110 pounds. The ABS shell provides weather protection. You get a side-opening lid that stays open for easy loading. A key lock secures your gear. It is a solid option if you need moderate extra space without a large footprint.
Pros
- 11 cubic feet of internal storage
- 110 lb maximum load capacity
- Side-opening lid stays open
- Key lock security system
- No tool assembly required
Cons
- 11 cubic feet is smaller than the 30 cubic feet option
- 110 lb limit is lower than typical hard-shell boxes
- Only fits vehicles with cross bars
Good fit if
- You have roof cross bars installed
- You need moderate extra storage space
- You want a side-opening design
Skip if
- You need more than 11 cubic feet of space
- Your vehicle only has roof rails
- You prefer a hard-shell construction
Verdict: DNA Motoring 11 Cu. Ft. Roof Cargo Box is a compact solution for drivers who need extra room but do not require the massive capacity of a 30 cubic feet carrier. It suits those with cross bars who value side access and a secure lock.
Specifications side by side
| Spec | FIVKLEMNZ 30 Cubic Feet Roof Bag | DNA Motoring 11 cu ft Roof Box |
|---|---|---|
| Capacity | 30 cu ft | 11 cu. ft. |
| Shell Type | 840D PVC soft bag | ABS |
| Opening | not stated | side |
| Load Capacity | not stated | 110 lbs |
| Water Resistance | 100% waterproof | not stated |
| Security | Luggage lock | key and lock |
| Installation | Straps and door hooks | no tool assembly |
| Vehicle Compatibility | With or without roof rack | fits vehicles with cross bars only |
| Dimensions | 60 x 43 x 20 in | 53" L x 34" W x 15" H |
| Recommended Use | Suitcases, tents, sleeping bags | not stated |
| Vehicle Type | Car | Car |
| Mount Type | Roof Mount | Roof Mount |
| Lockable | Lockable | Lockable |
| Weight | 12 pounds | not stated |
| Size | 30 Cubic Feet | 11 cu. ft. |
| Color | Black and Orange | Textured Black |
| Model | 30 Cubic Feet | PT-ZTL-8166-BK |
Frequently asked questions
Can I mount a 30 cubic feet soft bag on any car?
Yes, the FIVKLEMNZ 30 cubic feet roof bag is designed for vehicles without roof racks. It uses a roof mount system that secures directly to your car. This makes it ideal for travelers who lack cross bars. You get flexible storage without needing permanent hardware. The soft construction adapts to your roof shape.
What is the weight difference between these two carriers?
The FIVKLEMNZ soft bag weighs 12 pounds. The DNA Motoring hard box does not list a weight in its specs. You should check your vehicle manual for max roof load limits. The soft bag is lighter to handle during installation. The hard box provides rigid protection for your gear.
Does the 11 cubic feet box have side access?
The DNA Motoring 11 cu ft roof box is described as having side access in its verdict. This allows you to load items from the side of your vehicle. It is useful when parking in tight spaces. You can access your gear without climbing onto the roof or moving the car.
Is the 30 cubic feet bag waterproof?
The FIVKLEMNZ 30 cubic feet roof bag uses 840D PVC material. This material is fully waterproof. It protects your items from rain and snow. You do not need to use additional tarps. The soft design ensures a snug fit against your vehicle roof.
Which box is better for drivers with cross bars?
The DNA Motoring 11 cu ft roof box is best for drivers with cross bars. It mounts securely to standard roof racks. The 53 by 34 by 15 inch size fits well on most cross bars. You get a secure lock for added safety. It is a compact solution for moderate storage needs.
What are the dimensions of the 11 cubic feet box?
The DNA Motoring box measures 53 inches in length, 34 inches in width, and 15 inches in height. These dimensions provide 11 cubic feet of space. The textured black finish helps hide scratches. The compact size fits on smaller vehicles with standard roof racks.
Can the soft bag hold 110 pounds of gear?
The DNA Motoring box has a stated load capacity of 110 lb. The FIVKLEMNZ soft bag does not list a specific weight limit in its specs. You should distribute weight evenly on the soft bag. Always stay within your vehicle manufacturer's roof load limits for safety.