13 Cubic Feet vs 11 Cubic Feet Roof Cargo Boxes in 2026: Key Differences
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Choosing between a 13 Cubic Feet vs 11 Cubic Feet roof cargo box depends on your specific gear volume and vehicle width constraints. Both DNA Motoring models share identical features like side-opening lids, ABS construction, and key locks. The main difference lies in their dimensions and total storage volume. The larger box offers more length, while the smaller one provides greater width. You need to match these physical specs to your crossbar setup and luggage needs.
Key differences
| Aspect | DNA Motoring 13 cu ft Lockable Roof Box | DNA Motoring 11 cu ft Roof Box |
|---|---|---|
| Capacity | 13 Cubic Feet | 11 Cubic Feet |
| Length | 72 inches | 53 inches |
| Width | 30 inches | 34 inches |
| Height | 12 inches | 15 inches |
| Surface Finish | High Gloss Black | Black Texture |
Which one should you choose?
Choose DNA Motoring 13 cu ft Lockable Roof Box if
- You have longer crossbars and need to store bulky, linear items like skis or kayaks.
- You prefer a lower profile that sits closer to the roofline for better aerodynamics.
- You want a glossy finish that reflects light and resists dirt buildup.
Choose DNA Motoring 11 cu ft Roof Box if
- Your vehicle has narrow crossbars or limited roof width.
- You need extra height to stack taller items like suitcases or bins vertically.
- You prefer a textured surface that hides scratches and fingerprints better.
Verdict: The 13 cubic foot model suits those with wider roof racks who prioritize length and a sleek look. The 11 cubic foot option is better for narrower vehicles or those needing vertical stacking space. Both offer the same security and durability for your gear.
13 vs 11 Cu Ft Box Specs
Interior volume
The DNA Motoring 13 cu ft Lockable Roof Box offers 13 cubic feet of internal storage, while the 11 cu ft model provides 11 cubic feet. This two-cubic-foot difference matters if you carry bulky items like camping gear or sports equipment. The larger box holds more volume, giving you extra room for larger loads. The smaller box still offers ample space for typical weekend trips. You should measure your gear against these volumes to see which fits your needs best. Both models use ABS plastic for the shell, but the internal capacity is the primary differentiator here. Choose the 13 cu ft version if you need maximum space.
Overall dimensions
Length and width vary significantly between the two models. The 13 cu ft box measures 72 inches long by 30 inches wide. The 11 cu ft box is shorter at 53 inches long but wider at 34 inches. This trade-off affects how the box fits on your vehicle. The longer box may overhang more on shorter cars, while the wider box might interfere with side mirrors or open doors. Consider your vehicle’s roof width and length before deciding. The 13 cu ft model prioritizes length, while the 11 cu ft model prioritizes width. Both fit vehicles with crossbars only.
Weight capacity
Both roof boxes share the same maximum load capacity of 110 lbs when weight is evenly distributed. This limit applies to the total weight of your cargo, not just the volume. You must ensure your vehicle’s roof rack can support this weight plus the box’s own weight. The 13 cu ft box weighs 51.6 pounds, while the weight of the 11 cu ft model is not listed in the provided data. Regardless of the box’s empty weight, the 110 lb limit is the same for both. Always check your vehicle manufacturer’s guidelines for roof load limits.
Opening width
The opening width determines how easily you can load bulky items. The 13 cu ft box opens up to 14.5 inches wide. The 11 cu ft box opens up to 14 inches wide. This half-inch difference is minor but may matter for very wide items. Both models open from the side, allowing access from either side of the vehicle. This side-opening design is convenient for loading gear in tight parking spaces. The slight advantage goes to the 13 cu ft model for its wider opening, though both are practical for most cargo.
Surface finish
The exterior finish differs between the two models. The 13 cu ft box features a high gloss black finish. The 11 cu ft box has a textured black finish. Glossy finishes may show scratches more easily, while textured finishes can hide minor wear. Both are made from impact-resistant ABS material for durability. The finish choice is largely aesthetic, but it may affect how the box looks on your car. Some users prefer the sleek look of gloss, while others like the rugged appearance of texture. Both finishes are designed to withstand weather exposure.
Which DNA Motoring Roof Box Fits You
Need maximum interior volume for gear
This model provides 13 cubic feet of storage, offering two extra cubic feet compared to the smaller option. Its 72-inch length allows you to fit longer items easily. The 30-inch width keeps it narrower, which helps if your vehicle has limited roof width. You get the same 110-pound load capacity and secure key lock as the other model.
Have narrow roof bars or wide vehicle
This box is 34 inches wide, which may fit better on vehicles with narrow crossbars or wide roof rails. Its 53-inch length is shorter, reducing the overhang on smaller cars. You still get 11 cubic feet of space, 110-pound capacity, and side-opening access. The textured black finish offers a different look than the glossy option.
Prioritize side-opening convenience and security
Both boxes open from the side to accommodate tight parking spaces. This 13 cu ft model lets you access gear without stepping off the ground. It includes a key and lock system to secure valuables. The ABS shell protects contents from weather. You gain extra storage volume without sacrificing the easy side-loading mechanism found in both designs.
Quick picks
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | DNA Motoring 13 cu ft Lockable Roof Box | Bulky items on crossbar-equipped vehicles | Check price of DNA Motoring 13 cu ft Lockable Roof Box on Amazon |
| 2 | DNA Motoring 11 cu ft Roof Box | Moderate storage needs on cross bars | Check price of DNA Motoring 11 cu ft Roof Box on Amazon |
The products compared
DNA Motoring 13 cu ft Lockable Roof Box
Best for: Bulky items on crossbar-equipped vehicles
- 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 carrier offers 13 cubic feet of storage in a glossy black ABS shell. It measures 72 inches long, 30 inches wide, and 12 inches high. The unit supports up to 110 pounds of evenly distributed weight. It mounts to crossbars with no tools required. You can open the lid from the side for easy access. A key lock secures your cargo against theft.
Pros
- 13 cubic feet internal storage capacity
- Side-opening lid for wide access
- Tool-free installation on crossbars
- Key lock security system
- Impact-resistant ABS construction
Cons
- 110 lbs load limit is modest
- 72-inch length may overhang small cars
- 51.6 lbs weight adds roof burden
Good fit if
- You need extra space for bulky gear
- You have a vehicle with crossbars
- You want tool-free setup
Skip if
- You carry heavy loads over 110 lbs
- Your roof rack is too short for 72 inches
- You prefer a lighter carrier under 40 lbs
Verdict: DNA Motoring 13 Cu Ft Glossy Black Carrier fits you if you need ample room for long items and have a roof rack that supports its 72-inch span. It is a solid option for light to medium loads.
DNA Motoring 11 cu ft Roof Box
Best for: Moderate storage needs on cross bars
- 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 interior volume. It measures 53 inches long and 34 inches wide. The shell is made from impact-resistant ABS plastic. It mounts securely to cross bars without tools. The lid opens to the side for easy access. It supports up to 110 pounds of evenly distributed weight. This box suits drivers needing moderate extra storage space.
Pros
- 11 cubic feet of internal storage
- Side-opening lid for wide access
- Tool-free installation on cross bars
- Includes key and lock for security
- Impact-resistant ABS construction
Cons
- 110 lb load limit is lower than 13 cu. ft. competitors
- 53-inch length may not fit narrow vehicles
- No mention of aerodynamic design features
Good fit if
- You need moderate cargo space for weekend trips
- Your vehicle has cross bars for mounting
- You prefer side-opening access for bulky items
Skip if
- You require more than 11 cubic feet of space
- Your vehicle lacks cross bars
- You need to carry loads exceeding 110 pounds
Verdict: DNA Motoring 11 cu. ft. Roof Box fits drivers who prioritize secure, side-access storage for moderate loads on vehicles with cross bars.
Specifications side by side
| Spec | DNA Motoring 13 cu ft Lockable Roof Box | DNA Motoring 11 cu ft Roof Box |
|---|---|---|
| Capacity | 13 Cubic Feet | 11 cu. ft. |
| Shell Type | ABS | ABS |
| Opening | side | side |
| Load Capacity | 110 lbs | 110 lbs |
| Security | key and lock | key and lock |
| Installation | no tool assembly | no tool assembly |
| Vehicle Compatibility | fits for vehicles with cross bars only | fits vehicles with cross bars only |
| Dimensions | 72" L x 30" W x 12" H | 53" L x 34" W x 15" H |
| Vehicle Type | Car | Car |
| Mount Type | Roof Mount | Roof Mount |
| Lockable | Lockable | Lockable |
| Weight | 51.6 pounds | not stated |
| Size | 13 cu. ft. | 11 cu. ft. |
| Color | Glossy Black | Textured Black |
| Model | PT-ZTL-8326-GSBK | PT-ZTL-8166-BK |
Frequently asked questions
Can I fit a kayak in a 13 cubic feet roof box?
Yes, the 13 cubic feet model is better for long items. It measures 72 inches in length, providing ample space for longer gear. The 11 cubic feet version is only 53 inches long, which may restrict very long loads. Check your kayak length against these dimensions before buying.
Which roof box is better for narrow cars?
The 11 cubic feet box is wider at 34 inches, while the 13 cubic feet box is narrower at 30 inches. If your car has a narrow roof or tight crossbars, the 13 cubic feet model may fit more easily. Always measure your vehicle's roof width first.
Do both boxes have the same weight limit?
Yes, both DNA Motoring models share an identical load capacity of 110 lb. This means you can pack them equally heavy, regardless of the interior volume difference. Just ensure your vehicle’s roof rack supports this weight. Do not exceed the manufacturer's stated limit for safety.
How do the exterior dimensions differ between the two?
The 13 cubic feet box is longer (72 inches) but shorter in height (12 inches). The 11 cubic feet box is shorter (53 inches) but taller (15 inches). The 13 cubic feet unit also weighs 51.6 pounds. These differences affect aerodynamics and garage clearance.
Is the 13 cubic feet box harder to open?
No, both boxes feature side-opening lids for easy access. The DNA Motoring 13 cu ft model and the 11 cu ft model both allow you to load gear from the side. This design lets you access contents without climbing onto your roof, regardless of the size you choose.
Are both models lockable for security?
Yes, both the 13 cubic feet and 11 cubic feet boxes are lockable. They come with key locks to secure your gear while parked. This feature is standard on both models, so you do not lose security by choosing the smaller capacity box for your trips.
Does the color affect the box performance?
The 13 cubic feet box comes in Glossy Black, while the 11 cubic feet box is Textured Black. The finish does not change the internal volume or weight capacity. Choose the color based on your vehicle’s aesthetic. Both finishes are designed for durability and weather resistance.
Which box is lighter to install?
The 13 cubic feet box weighs 51.6 pounds. The 11 cubic feet box’s weight is not specified in the data. Generally, the longer 13 cubic feet model may feel bulkier due to its 72-inch span. Consider your roof rack’s ease of use when handling longer carriers.