Mockins 40 CuFt XXL Soft-Shell vs Mockins 30 Cu Ft Navy (2026): Key Differences
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When you compare the mockins 40 cuft xxl soft shell vs 30 cu ft navy, you are looking at two soft-shell roof bags from the same brand. Both offer waterproof storage for cars, SUVs, and trucks, and both include mounting hardware for vehicles with or without racks. The main difference lies in their size and footprint. The 40 cu ft model provides more volume and a wider base, while the 30 cu ft version offers a smaller, more compact profile for easier loading and lower wind resistance.
Key differences
| Aspect | Mockins 40 cu ft XXL Soft-Shell Roof Bag | Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag |
|---|---|---|
| Capacity | 40 cu ft | 30 cu ft |
| Dimensions | 72 x 48 x 20 in | 60 x 43 x 20 in |
| Weight | 15.7 pounds | 12.4 pounds |
| Included Hardware | 3 buckle straps, 3 ratchet straps, 6 door hooks, 2 trunk hooks, roof mat, combo lock, carry bag | Heavy-duty straps, door hook system, anti-slip roof mat |
| Color | Black/Orange | Navy Blue |
Which one should you choose?
Choose Mockins 40 cu ft XXL Soft-Shell Roof Bag if
- You need maximum storage space for large items like multiple suitcases or bulky camping gear.
- You want a wider base that covers more roof area for better stability on wide vehicles.
- You prefer a complete kit that includes a combination lock and more mounting hooks.
Choose Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag if
- You drive a smaller vehicle or have limited roof space and need a compact footprint.
- You want a lighter bag that is easier to lift and secure on your own.
- You prioritize a lower profile to minimize wind drag and noise during highway travel.
Verdict: Choose the 40 cu ft XXL if you prioritize volume and a comprehensive accessory kit. Pick the 30 cu ft Navy Blue if you need a lighter, more manageable bag that fits smaller roofs. Both models provide reliable waterproof protection and flexible mounting options.
Capacity, Size, And Weight Comparison
Storage Capacity
The Mockins 40 CuFt XXL Soft-Shell Roof Bag offers 40 cubic feet of storage space, while the Mockins 30 Cu Ft Navy provides 30 cubic feet. This 10 cubic foot difference is significant if you plan to haul large items like multiple suitcases, tents, or sleeping bags. The larger model is designed for heavier loads and longer trips where maximizing volume is critical. If your cargo needs are modest, the smaller 30 cubic foot option may suffice. You should choose based on the total volume of gear you intend to transport. The extra space in the 40 CuFt model allows for more flexible packing arrangements.
External Dimensions
Size matters when fitting a roof bag to your vehicle. The 40 CuFt model measures 72 inches long, 48 inches wide, and 20 inches high. The 30 Cu Ft Navy measures 60 inches long, 43 inches wide, and 20 inches high. Both share the same height, so wind profile is similar, but the 40 CuFt bag is longer and wider. You must ensure your vehicle roof can accommodate the larger footprint of the 40 CuFt bag without overhang. The 30 Cu Ft Navy has a more compact footprint, making it easier to fit on smaller sedans or compact SUVs. Check your vehicle’s roof dimensions carefully before deciding.
Product Weight
Weight affects fuel efficiency and roof load limits. The Mockins 40 CuFt XXL Soft-Shell Roof Bag weighs 15.7 pounds. The Mockins 30 Cu Ft Navy weighs 12.4 pounds. The 30 Cu Ft Navy is lighter by 3.3 pounds. While this difference seems small, every pound adds to your vehicle’s roof load. If your car has a low roof weight limit, the lighter 30 Cu Ft Navy might be safer. The 40 CuFt model is heavier due to its larger surface area and more material. Consider your vehicle’s maximum roof load capacity when choosing between these two soft-shell carriers.
Material And Build
Both bags use abrasion-resistant vinyl for durability, but the specifications highlight specific details for the 30 Cu Ft Navy. It is crafted from 840D vinyl with welded seams and reinforced stitching. The 40 CuFt model mentions reinforced seams but does not specify the vinyl denier in the provided data. Both feature waterproof zippers and protective flaps to keep gear dry. The 30 Cu Ft Navy also includes an anti-slip roof mat to protect paint and stabilize the load. Both models offer a 10-year limited warranty. The specific 840D vinyl detail gives the 30 Cu Ft Navy a slight edge in described build quality.
Mounting Hardware
Both packages include essential mounting hardware for secure installation. The 40 CuFt model comes with 3 buckle straps, 3 ratchet straps, 6 door hooks, 2 trunk hooks, a car roof mat, a combo lock, and a carry bag. The 30 Cu Ft Navy includes door hooks and heavy-duty straps, along with an anti-slip roof mat. Both support mounting with or without crossbars or side rails. The 40 CuFt model lists a specific number of hooks and straps, suggesting a comprehensive kit. The 30 Cu Ft Navy emphasizes its no-rack readiness with a door hook system. Both provide the tools needed for a secure fit on various vehicle types.
Which Roof Bag Fits Your Needs
You need maximum cargo space for large loads
This 40 cubic foot bag measures 72 inches long and 48 inches wide. The extra 10 cubic feet of volume and larger footprint allow you to haul significantly more gear. It is the best choice for moving or extended trips where you need every bit of available roof storage capacity.
You prioritize a lighter load for fuel efficiency
Weighing only 12.4 pounds, this 30 cubic foot bag is lighter than the larger option. Its compact 60-inch length and 43-inch width create a smaller aerodynamic profile. You will benefit from reduced wind drag and less added weight on your vehicle roof during highway travel.
You want a compact bag for smaller vehicles
With dimensions of 60 by 43 inches, this navy blue bag fits well on sedans or smaller SUVs. The shorter length ensures it does not overhang excessively. You get reliable waterproof protection and secure mounting without the bulk of the XXL model, making it ideal for urban commutes.
The products compared
Mockins 40 cu ft XXL Soft-Shell Roof Bag
Best for: Hauling bulky luggage on wide roofs
- Capacity
- 40 cu ft
- Shell Type
- Soft shell (vinyl)
- Water Resistance
- Waterproof
- Security
- Combo lock
- Installation
- Buckle/ratchet straps, door hooks
- Vehicle Compatibility
- With or without roof rack
View on Amazon: Mockins 40 cu ft XXL Soft-Shell Roof Bag Affiliate link
This is a 40 cubic foot soft-shell roof bag measuring 72 by 48 by 20 inches. It offers waterproof protection with reinforced seams and waterproof zippers. The design fits vehicles with or without roof racks, using hooks or straps for attachment. It includes a roof mat and locking hardware. This XXL carrier suits you if you need maximum overhead storage for large items like suitcases or sleeping bags.
Pros
- Generous 40 cubic foot capacity
- Fits vehicles with or without roof racks
- Waterproof design with reinforced seams
- Includes roof mat and locking straps
Cons
- Heavier at 15.7 pounds
- Larger footprint requires more roof space
- Soft shell offers less aerodynamic efficiency
Good fit if
- You have a wide vehicle roof
- You need to transport bulky gear
- Your vehicle lacks roof racks
Skip if
- You prioritize aerodynamic fuel efficiency
- You have a narrow roof rack
- You prefer hard-shell durability
Verdict: Mockins 40 CuFt Soft-Shell Roof Bag provides ample space for large loads. It fits you if you need to haul bulky items like luggage or tents on a wide vehicle roof.
Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag
Best for: Bare roof vehicles needing waterproof storage
- Capacity
- 30 cu ft
- Shell Type
- 840D vinyl soft shell
- Water Resistance
- Waterproof
- Installation
- Door hook system and straps
- Vehicle Compatibility
- Crossbars, side rails, or bare roof
- Dimensions
- 60 x 43 x 20 in
View on Amazon: Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag Affiliate link
This 30 cubic foot soft-shell roof bag measures 60 inches by 43 inches. It weighs 12.4 pounds and uses 840D vinyl construction. The design includes welded seams and a waterproof zipper. You can mount it on crossbars, side rails, or a bare roof using the included door hooks. This setup frees up cabin space for luggage or gear during travel.
Pros
- 30 cubic foot capacity holds 6-8 large suitcases
- 840D vinyl shell with welded seams for waterproofing
- Mounts to bare roofs using included door hooks
- Low profile 20-inch height minimizes wind drag
Cons
- 30 cubic foot capacity is smaller than the 40 cubic foot competitor
- Soft-shell material offers less rigid protection than hard cases
- Manual strap tightening requires physical effort
Good fit if
- You need a flexible bag for vehicles without roof racks
- You prioritize a lower profile to reduce wind noise
- You want a waterproof solution for bad weather travel
Skip if
- You require the maximum 40 cubic foot storage volume
- You prefer a rigid hard-shell for maximum impact protection
- You want a bag with integrated locking mechanisms
Verdict: Mockins 30 CuFt Navy Soft-Shell Roof Bag fits drivers who need flexible, rack-free mounting and reliable waterproofing. It suits those who do not need the extra volume of the larger 40 cubic foot model.
Specifications side by side
| Spec | Mockins 40 cu ft XXL Soft-Shell Roof Bag | Mockins 30 Cu Ft Navy Blue Soft Shell Roof Bag |
|---|---|---|
| Capacity | 40 cu ft | 30 cu ft |
| Shell Type | Soft shell (vinyl) | 840D vinyl soft shell |
| Water Resistance | Waterproof | Waterproof |
| Security | Combo lock | not stated |
| Installation | Buckle/ratchet straps, door hooks | Door hook system and straps |
| Vehicle Compatibility | With or without roof rack | Crossbars, side rails, or bare roof |
| Dimensions | 72 x 48 x 20 in | 60 x 43 x 20 in |
| Recommended Use | Suitcases, sleeping bags | Suitcases, tents, sleeping bags |
| Vehicle Type | Car, SUV, Truck, Van | Car |
| Mount Type | Roof Mount | Roof Mount |
| Includes Bag | not stated | With Bag |
| Weight | 15.7 pounds | 12.4 pounds |
| Size | 40 Cubic Feet | 30 Cubic Feet |
| Color | Black/Orange | Navy Blue |
| Model | MA-RB-40BLK-89-V2 | MA-RB-30NVYBG-60X43X20-18 |
Frequently asked questions
Which roof bag is better for wide vehicles?
The 40 CuFt XXL model is the better choice for wide vehicle roofs. Its width measures 48 inches, compared to the 43-inch width of the 30 CuFt Navy bag. This wider footprint allows you to utilize more of the roof surface area. It is specifically designed for hauling bulky luggage on wider platforms.
How much heavier is the larger soft shell bag?
The larger 40 CuFt bag weighs 15.7 pounds. The smaller 30 CuFt Navy version weighs 12.4 pounds. This means the XXL model is 3.3 pounds heavier. You should consider this difference if you frequently need to remove the bag for storage or transport.
What are the length differences between the two bags?
The 40 CuFt XXL bag is 72 inches long. The 30 CuFt Navy bag is 60 inches long. The 12-inch length difference provides significantly more linear space for long items like skis or kayaks. Check your vehicle roof length to ensure the larger model fits without overhang.
Do both bags have the same height profile?
Yes, both bags share the same height specification. The 40 CuFt XXL and the 30 CuFt Navy models are both 20 inches tall. This consistent height means they have similar aerodynamic profiles and clearance requirements. Your vehicle roof rack height limits will apply equally to both options.
Is the navy blue bag suitable for bare roofs?
The 30 CuFt Navy bag is suitable for bare roofs. It features a soft shell design with roof mount capabilities that do not require racks. This makes it ideal for vehicles without existing roof rails. The 40 CuFt model is also a soft shell, but the navy option is noted for flexible mounting.
Which model has a higher storage capacity?
The Mockins 40 CuFt XXL Soft-Shell Roof Bag has the higher capacity. It offers 40 cubic feet of storage space. The Navy model provides 30 cubic feet. The 10 cubic foot difference is substantial for hauling large volumes of gear, camping equipment, or multiple suitcases.