13 Cubic Feet or 30 Cubic Feet Roof Cargo Boxes? Compared by Specs
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Choosing between a 13 Cubic Feet vs 30 Cubic Feet roof cargo box depends on your vehicle and load needs. Both options mount to your roof to free up interior space. The main difference is storage volume and construction material. One uses a rigid shell, while the other uses a soft bag. You need to match the size to your roof rack and cargo volume.
Key differences
| Aspect | DNA Motoring 13 cu ft Lockable Roof Box | FIVKLEMNZ 30 Cubic Feet Roof Bag |
|---|---|---|
| Capacity | 13 Cubic Feet | 30 Cubic Feet |
| Shell Type | ABS | 840D PVC |
| Dimensions | 72" L x 30" W x 12" H | 60" L x 43" W x 20" H |
| Load Capacity | 110 lbs | not listed |
| Installation | No tool assembly | 10 reinforced straps, 6 door hooks |
| Water Resistance | not listed | 100% Waterproof |
Which one should you choose?
Choose DNA Motoring 13 cu ft Lockable Roof Box if
- You need a rigid, lockable box for secure storage.
- Your vehicle has a narrow width and you need a longer box.
- You prefer a low-profile design that sits closer to the roof.
Choose FIVKLEMNZ 30 Cubic Feet Roof Bag if
- You require maximum storage volume for large items.
- You want a waterproof bag that works without a roof rack.
- You need a lightweight carrier that packs away compactly.
Verdict: The 13 Cubic Feet box suits those who prioritize security and a rigid shell for smaller loads. The 30 Cubic Feet bag is better for bulky gear and vehicles without crossbars. Select the option that matches your roof hardware and cargo volume.
13 Cubic Feet vs 30 Cubic Feet Specs
storage capacity
The DNA Motoring box offers 13 cubic feet of internal storage, which is suitable for a few large suitcases or weekend gear. The FIVKLEMNZ bag provides 30 cubic feet of space, enough for seven to nine suitcases, tents, and sleeping bags. This volume difference is significant. If you need to carry bulky items like camping equipment or large luggage sets, the larger bag holds much more. The smaller box is better if you only have a few bags to move. Choose based on how much stuff you actually need to transport on your trip.
shell material
The DNA Motoring unit is built from rigid, impact-resistant ABS plastic with a high gloss black finish. This hard shell protects contents from weather and debris. The FIVKLEMNZ carrier uses flexible 840D PVC material with high-frequency welded seams and a double-layered waterproof cover. The plastic box is durable against impacts, while the soft bag is designed to be 100% waterproof. The hard shell offers structural protection, whereas the soft bag focuses on water resistance. Your choice depends on whether you prefer rigid protection or flexible, waterproof storage.
weight
The DNA Motoring box weighs 51.6 pounds, which adds noticeable weight to your vehicle roof. The FIVKLEMNZ bag is much lighter at just 12 pounds. This weight difference matters for fuel efficiency and roof load limits. The lighter bag is easier to handle during installation and removal. It also puts less stress on your vehicle roof and rack system. If you want to minimize added weight, the soft bag is the clear choice. The heavier hard box may affect handling slightly more due to its mass.
installation method
The DNA Motoring box requires crossbars for installation and uses a no-tool assembly system. It is not compatible with vehicles lacking crossbars. The FIVKLEMNZ bag uses 10 reinforced straps and 6 door hooks, allowing it to fit vehicles with or without roof racks, side rails, or crossbars. The bag is more versatile for installation. You can secure it to almost any vehicle roof. The hard box is limited to cars with existing crossbars. If your vehicle lacks a rack, the soft bag is your only option.
load capacity
The DNA Motoring box has a maximum load capacity of 110 pounds when weight is evenly distributed. The FIVKLEMNZ bag does not list a specific weight limit in its specifications. You should check the bag manual for its limit, but the hard box provides a clear 110-pound rating. This is important for heavy items like tools or sports equipment. The soft bag may be better for bulky, lighter items. If you need to carry heavy gear, the hard box offers a defined weight limit you can rely on.
security features
The DNA Motoring box includes a key and lock system to secure valuables and ensure proper lid alignment. It also opens from the side for easier access. The FIVKLEMNZ bag comes with a luggage lock, but its soft construction offers less physical protection than a hard shell. The hard box provides better theft deterrence and weather sealing. The bag relies on straps and hooks for stability. For high-value items, the locked hard box is more secure. The bag is convenient but offers less physical barrier against tampering.
Which roof cargo carrier fits your needs
Drivers with crossbars needing secure storage
You have crossbars and want a rigid, lockable solution. This DNA Motoring box offers 13 cubic feet of space with a 110 lb load limit. Its ABS shell resists impact and weather. The key lock secures your gear. It fits vehicles with crossbars only, providing a stable and protected storage option for weekend trips.
Families needing maximum capacity without racks
You need 30 cubic feet of space for large family loads. This FIVKLEMNZ bag holds seven to nine suitcases. It mounts with straps and door hooks, requiring no roof rack. The 840D PVC material is fully waterproof. This soft carrier expands your vehicle's storage instantly, making it ideal for long road trips or camping vacations.
Budget conscious shoppers prioritizing low weight
You want a lightweight carrier that does not add significant weight to your vehicle. This soft bag weighs only 12 pounds, compared to the 51.6 pounds of the hard shell alternative. It provides ample 30 cubic feet of storage. The compact design includes a storage bag for easy transport when not in use.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | DNA Motoring 13 cu ft Lockable Roof Box | moderate cargo needs with crossbars | Check price of DNA Motoring 13 cu ft Lockable Roof Box on Amazon |
| 2 | FIVKLEMNZ 30 Cubic Feet Roof Bag | SUVs without roof racks needing large capacity | Check price of FIVKLEMNZ 30 Cubic Feet Roof Bag on Amazon |
The products compared
DNA Motoring 13 cu ft Lockable Roof Box
Best for: moderate cargo needs with crossbars
- Capacity
- 13 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 13 cu ft Lockable Roof Box Affiliate link
This DNA Motoring roof box offers 13 cubic feet of storage and supports up to 110 lbs. It measures 72 inches long and fits vehicles with crossbars only. The ABS shell is impact-resistant and includes a key lock. You get side-opening access and tool-free installation. It suits those needing moderate cargo space for weekend trips.
Pros
- 13 cubic feet internal storage capacity
- 110 lbs maximum load capacity
- Key and lock security system included
- Tool-free installation on crossbars
- Side-opening lid for easy access
Cons
- 110 lbs load limit is lower than 30 cu ft competitors
- Requires existing crossbars for mounting
- 51.6 lb weight adds roof load
Good fit if
- You have a vehicle with crossbars
- You need moderate storage for 1-2 weekend trips
- You prefer side-opening access for bulky items
Skip if
- You need to carry more than 110 lbs
- Your vehicle lacks crossbars
- You require a larger 30 cubic feet capacity
Verdict: DNA Motoring 13 Cu Ft Glossy Black Cargo Box fits drivers who need secure, moderate storage without complex installation. It is a solid option for small families or couples with crossbars.
FIVKLEMNZ 30 Cubic Feet Roof Bag
Best for: SUVs without roof racks needing large capacity
- 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 roof cargo bag offers 30 cubic feet of storage space, measuring 60 by 43 by 20 inches. It is constructed from 840D PVC material with high-frequency welded seams to ensure 100% waterproof protection. The bag weighs 12 pounds and uses 10 reinforced straps and 6 door hooks for mounting. It fits vehicles with or without existing roof racks, making it suitable for SUVs and larger cars needing extra gear capacity.
Pros
- 30 cubic feet of capacity for large loads
- 100% waterproof 840D PVC construction
- Mounts to vehicles without roof racks
- Includes 10 reinforced straps and 6 door hooks
- Lightweight at 12 pounds
Cons
- Soft shell offers less aerodynamic efficiency than hard shells
- No mention of integrated lock mechanism
- Dimensions may exceed width limits for some small cars
Good fit if
- You need maximum storage volume for long trips
- Your vehicle lacks a roof rack system
- You require waterproof protection for sensitive gear
Skip if
- You prefer a rigid hard shell for better aerodynamics
- You drive a small car with narrow roof space
- You want a permanently mounted fixed carrier
Verdict: FIVKLEMNZ 30 Cubic Feet Soft Roof Bag is a high-capacity solution for SUV owners without roof racks who prioritize waterproof storage over aerodynamic efficiency.
Specifications side by side
| Spec | DNA Motoring 13 cu ft Lockable Roof Box | FIVKLEMNZ 30 Cubic Feet Roof Bag |
|---|---|---|
| Capacity | 13 Cubic Feet | 30 cu ft |
| Shell Type | ABS | 840D PVC soft bag |
| Opening | side | not stated |
| Load Capacity | 110 lbs | not stated |
| Water Resistance | not stated | 100% waterproof |
| Security | key and lock | Luggage lock |
| Installation | no tool assembly | Straps and door hooks |
| Vehicle Compatibility | fits for vehicles with cross bars only | With or without roof rack |
| Dimensions | 72" L x 30" W x 12" H | 60 x 43 x 20 in |
| Recommended Use | not stated | Suitcases, tents, sleeping bags |
| Vehicle Type | Car | Car |
| Mount Type | Roof Mount | Roof Mount |
| Lockable | Lockable | Lockable |
| Weight | 51.6 pounds | 12 pounds |
| Size | 13 cu. ft. | 30 Cubic Feet |
| Color | Glossy Black | Black and Orange |
| Model | PT-ZTL-8326-GSBK | 30 Cubic Feet |
Frequently asked questions
Can a 30 cubic feet roof bag fit on a car without roof racks?
Yes, the FIVKLEMNZ 30 Cubic Feet Roof Bag is designed for this. It mounts directly to the roof without requiring crossbars or a rack system. This makes it a practical choice for SUV owners who need large capacity but lack existing roof hardware. The bag straps securely to the vehicle for transport.
What is the weight difference between a hard shell box and a soft bag?
The DNA Motoring 13 cu ft hard shell weighs 51.6 pounds. The FIVKLEMNZ 30 cu ft soft bag weighs only 12 pounds. The soft bag is significantly lighter, which may help with fuel efficiency and ease of handling. The hard shell provides more structural rigidity but adds substantial weight to your roof load.
Is the 13 cubic feet box lockable for security?
Yes, the DNA Motoring 13 cu ft Glossy Black Cargo Box is lockable. This feature helps secure your gear against theft while you are parked. The rigid ABS shell also offers impact resistance. This combination of locking mechanism and durable material makes it suitable for drivers prioritizing cargo safety.
How wide is a 30 cubic feet roof bag compared to a standard box?
The FIVKLEMNZ 30 Cubic Feet Roof Bag is 60 inches wide. In contrast, the DNA Motoring 13 cu ft box is 30 inches wide. The soft bag is twice as wide, allowing for a larger footprint. You must ensure your vehicle roof can accommodate this width without overhang.
What is the maximum load capacity for a 13 cubic feet hard shell?
The DNA Motoring 13 cu ft box has a load capacity of 110 lb. This limit applies to the weight of the cargo you place inside. You must not exceed this weight to ensure safe driving and prevent damage to your vehicle’s roof or the box itself. Always distribute weight evenly.
Does the 30 cubic feet bag have a rigid structure?
No, the FIVKLEMNZ product is a soft roof bag. It lacks the rigid ABS shell found in hard cases like the DNA Motoring option. This means it does not offer the same level of impact resistance. However, it provides high capacity and waterproof storage for vehicles without roof racks.
Which option is better for a small family or couple?
The DNA Motoring 13 cu ft box is ideal for small families or couples. It offers moderate storage for weekend gear or a few large suitcases. The rigid shell protects contents from weather and theft. It fits well on cars with crossbars, providing a secure and organized solution for smaller loads.