Thule 611330 Caprock Cargo Box Alternatives: 6 Similar Picks Compared
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You are looking for thule 611330 caprock cargo box alternatives that match its compact profile. The original Thule Caprock kit is a slim, lightweight carrier measuring 31.9 inches in length and weighing just 3.97 pounds. Its low height of 2.56 inches makes it ideal for vehicles with tight roof rack clearance. However, you might need more volume or a different mounting style. The original is a hard shell designed for small loads, which limits its utility for larger gear or families.
These 6 alternatives were chosen because their specifications overlap with the original in key areas like capacity or mounting type. Some options offer soft shell designs for vehicles without roof rails, providing waterproof storage without permanent installation. Others provide significantly higher cubic footage for extended trips. You will find picks that prioritize aerodynamic efficiency, budget-friendly prices, or massive XXL capacity. Each product listed here addresses specific gaps left by the Caprock’s minimal dimensions. Review the specs to see which carrier fits your vehicle and storage needs best.
Our top pick: Thule Caprock Cargo Box Kit One Size.
Comparing Caprock Alternatives
Sailnovo 21 cu ft Soft Roof Bag
The Sailnovo 21 cu ft Soft Roof Bag offers significantly more volume than the Thule Caprock, which lacks a defined cubic capacity in its specs. This soft carrier weighs 8.16 pounds, more than double the Caprock’s 3.97 pounds. It measures 7.09 inches wide and 13.8 inches high, creating a much bulkier profile than the Caprock’s 2.56-inch height. You gain flexibility and waterproof storage without permanent racks. However, you sacrifice the rigid protection and aerodynamic efficiency of the hard shell. Choose this if you need extra space and do not have roof rails installed.
RoofPax 19 cu ft Polyester Roof Bag
The RoofPax 19 cu ft Polyester Roof Bag provides 19 cubic feet of storage, far exceeding the compact utility of the Thule Caprock. It weighs 12.4 pounds, which is over three times the weight of the 3.97-pound Caprock. Its dimensions are 47.2 inches long and 19.8 inches high, making it substantially larger than the Caprock’s 31.9-inch length and 2.56-inch height. This soft shell suits vehicles without roof racks. You get ample weather protection and capacity. You give up the low-profile aerodynamics and rigid security of the hard box. Pick this option when you prioritize volume and rack-free mounting over compact design.
Asinking 20 cu ft Waterproof Roof Bag
The Asinking 20 cu ft Waterproof Roof Bag delivers 20 cubic feet of capacity, a massive increase over the Thule Caprock’s limited storage. It measures 52 inches long and 18.5 inches high, creating a much larger footprint than the Caprock’s 31.9-inch length and 2.56-inch height. The specs do not list a weight, but the volume implies it is heavier. This bag features lockable security, which the Caprock kit does not explicitly mention. You gain extensive weather protection and high capacity for cars without racks. You sacrifice the slim profile and lightweight nature of the Thule. Select this if you need maximum space and secure, flexible storage.
Thule Motion 3 XL Roof Cargo Box
The Thule Motion 3 XL Roof Cargo Box is an X-Large hard shell, contrasting sharply with the Caprock’s One Size compact design. It offers 18 cubic feet of storage, vastly more than the Caprock. The specs do not list its weight or exact dimensions, but the size category indicates it is significantly larger and heavier than the 3.97-pound Caprock. It provides rigid, aerodynamic protection similar to the Caprock but on a much bigger scale. You gain secure, weatherproof storage for frequent travel. You give up the ultra-low height and minimal weight of the Caprock. Choose this when you need high capacity and do not mind a larger roof profile.
Mockins 40 cu ft XXL Roof Bag
The Mockins 40 cu ft XXL Roof Bag offers 40 cubic feet of storage, dwarfing the Thule Caprock’s compact utility. It weighs 16.5 pounds, more than four times the Caprock’s 3.97 pounds. Its dimensions are 72 inches long and 20 inches high, creating a massive profile compared to the Caprock’s 31.9-inch length and 2.56-inch height. This soft shell requires no roof racks. You gain enormous volume and flexibility for large loads. You sacrifice the aerodynamic efficiency and rigid protection of the hard shell. Pick this option if you need to transport bulky items and lack roof rails, accepting the higher weight and larger size.
BagMate 23 cu ft Roof Bag – 840D PVC
The BagMate 23 cu ft Roof Bag provides 23 cubic feet of capacity, significantly more than the Thule Caprock. It weighs 13.1 pounds, over three times the Caprock’s 3.97 pounds. The bag measures 55 inches long and 19.5 inches high, much larger than the Caprock’s 31.9-inch length and 2.56-inch height. It features 840D PVC material for durability. You gain high capacity and universal fit for vehicles without racks. You give up the low-profile design and rigid security of the hard box. Choose this if you prioritize volume and flexible mounting over the compact, lightweight nature of the Thule Caprock.
Quick picks
Our 7 picks
Thule Caprock Cargo Box Kit One Size
Best for: small loads on low-profile racks
- Dimensions
- 31.9 x 2.24 x 2.56 in
- Size
- One Size
- Weight
- 3.97 pounds
This is a compact, soft-sided rooftop cargo carrier from Thule. It measures 31.9 inches long, 2.24 inches wide, and 2.56 inches high. The unit weighs just 3.97 pounds. Its low profile makes it suitable for vehicles with limited clearance. You can use it to protect gear during rugged adventures. It is designed for easy setup and straightforward use. The black finish blends with most roof racks.
Pros
- Extremely low height of 2.56 inches
- Lightweight build at 3.97 pounds
- Compact length of 31.9 inches
- Dedicated protection for gear
Cons
- No specified volume capacity listed
- Soft material offers less impact resistance than hard shells
- Limited storage space compared to standard cargo boxes
Good fit if
- You need a carrier that fits under low roof racks
- You require a lightweight option for easier handling
- You have small items to transport securely
Skip if
- You need to carry large or bulky items
- You require a rigid, hard-shell enclosure
- You want a high-capacity storage solution
Verdict: Thule Caprock 611330 Compact Carrier is a slim, lightweight option for small loads. It fits best on vehicles with tight roof rack clearance.
Sailnovo 21 cu ft Soft Roof Bag
Best for: Budget storage without roof racks
- Capacity
- 21 cubic feet
- Shell Type
- Soft Shell
- Water Resistance
- Waterproof
- Installation
- Tie-Down Strap
- Dimensions
- 9.84 x 7.09 x 13.8 in
- Vehicle Type
- Car
The Sailnovo 21 cubic feet roof bag offers soft-shell storage for your vehicle. It weighs 8.16 pounds and measures 9.84 by 7.09 by 13.8 inches. The design uses tie-down straps for installation and claims waterproof protection. This flexible carrier fits cars without roof racks. It provides a lightweight alternative to hard plastic boxes for seasonal gear.
Pros
- 21 cubic feet of storage capacity
- Lightweight at 8.16 pounds
- Waterproof soft-shell construction
- No roof racks required for installation
Cons
- Soft shell offers less impact protection than hard cases
- Tie-down straps may allow more movement than rigid mounts
- Aerodynamic profile is lower than hard-shell boxes
Good fit if
- You need extra space for bulky items like sleeping bags
- You want a lightweight carrier that is easy to store when not in use
- Your vehicle lacks roof rack crossbars
Skip if
- You require maximum security against theft or vandalism
- You frequently drive on rough roads with debris
- You need a rigid structure to protect fragile items
Verdict: Sailnovo 21 Cuft Soft Roof Bag is a practical option for drivers who need flexible, waterproof storage without installing permanent roof racks. It suits those prioritizing capacity and weight over rigid protection.
RoofPax 19 cu ft Polyester Roof Bag
Best for: cars without roof racks needing waterproof soft storage
- Capacity
- 19 Cubic feet
- Shell Type
- polyester
- Water Resistance
- 100% waterproof
- Installation
- door hook straps, 10 straps
- Vehicle Compatibility
- fits cars with or without roof rack
- Dimensions
- 47.2 x 35.4 x 19.8 in
The RoofPax 19 Cubic Feet bag offers soft storage for roof racks or bare roofs. It measures 47.2 x 35.4 x 19.8 inches and weighs 12.4 pounds. The polyester shell is 100% waterproof with dual zippers and double-seam technology. It uses patented 4-door hook straps for security. This carrier fits vehicles with or without racks, making it a versatile option for extra cargo space.
Pros
- 19 Cubic feet of capacity
- 100% waterproof polyester shell
- Patented 4-door hook straps
- Fits cars with or without racks
- Dual zipper weatherproofing
Cons
- 19 Cubic feet is smaller than the 21-30 CuFt bags on this list
- Soft polyester material offers less impact protection than hard shells
- No hard shell to protect contents from hail or debris
Good fit if
- You need a bag that fits cars without roof racks
- You want 100% waterproof protection for your gear
- You prefer a soft carrier that folds flat for storage
Skip if
- You require more than 19 Cubic feet of space
- You want a hard shell for maximum impact resistance
- You prefer a rigid box for better aerodynamics
Verdict: RoofPax 19 CuFt Waterproof Rooftop Bag is a secure, waterproof soft carrier for drivers who need extra space but lack roof racks. It suits those prioritizing weather protection and rack compatibility over rigid shell durability.
Asinking 20 cu ft Waterproof Roof Bag
Best for: cars without roof rails
- Capacity
- 20 cu ft
- Shell Type
- 900D PVC tarpaulin
- Water Resistance
- 100% waterproof
- Security
- Lock
- Installation
- Metal ring strap design
- Vehicle Compatibility
- With or without roof rack
The Asinking 20 cubic foot roof bag uses 900D PVC tarpaulin for 100% waterproof protection. It measures 52 by 40 inches and holds up to 18.5 inches in height. The design fits vehicles with or without roof racks. You get a lockable closure and metal ring straps for easy installation. This soft shell offers a quiet ride and folds flat for storage when not in use.
Pros
- 20 cubic feet of storage capacity
- 100% waterproof 900D PVC tarpaulin shell
- Lockable for security
- Fits vehicles with or without roof racks
- Folds flat for compact storage
Cons
- Soft shell is less aerodynamic than hard boxes
- No integrated mounting hardware for bare roofs
- Manual installation requires careful strap adjustment
Good fit if
- You need extra space on a car without roof rails
- You want a waterproof solution for wet climates
- You need a foldable carrier for seasonal storage
Skip if
- You prefer the rigid protection of a hard shell
- You drive frequently at high highway speeds
- You want a permanent fixed mount
Verdict: Asinking 20 cu ft Soft Roof Bag provides ample waterproof storage for cars lacking roof racks. It suits travelers who prioritize capacity and weather protection over aerodynamic efficiency.
Thule Motion 3 XL Roof Cargo Box
Best for: Secure, aerodynamic storage with quick mounting
- Capacity
- 18 cu ft
- Load Capacity
- 165 lbs
- Security
- Slide lock
- Installation
- PowerClick quick-mount
- Vehicle Compatibility
- Select Thule rack systems
- Dimensions
- 84.7 x 35 x 17 in
The Thule Motion 3 XL offers 18 cubic feet of cargo space with a wing-shaped aerodynamic profile. It uses the PowerClick quick-mount system with an integrated torque indicator for secure installation. The box holds up to 165 lb and features a SlideLock security system. Its forward-leaning nose reduces drag, and the lid opens from the front for easy trunk access. This white glossy model measures 84.7 inches long.
Pros
- 18 cubic feet capacity for gear
- PowerClick quick-mount with torque indicator
- SlideLock security system
- Aerodynamic wing-shaped profile
- Front-opening lid design
Cons
- 18 cubic feet is smaller than 21+ cu ft soft bags
- 165 lb load limit is lower than some soft bags
- 84.7 inch length may not fit all roof racks
Good fit if
- You need secure, weatherproof storage for road trips
- You want quick installation with a torque indicator
- You prefer an aerodynamic hard shell design
Skip if
- You need more than 18 cubic feet of space
- You prefer a soft bag for lower profile
- You have a roof rack with limited length
Verdict: The Thule Motion 3 XL 18cuft Cargo Box fits drivers who prioritize secure, aerodynamic storage and easy installation. It suits those who need reliable weather protection and quick mounting for frequent travel.
Mockins 40 cu ft XXL Roof Bag
Best for: Large loads on vehicles without roof racks
- Capacity
- 40 cu ft
- Shell Type
- 840D vinyl
- Water Resistance
- waterproof
- Dimensions
- 72 x 48 x 20 in
- Vehicle Type
- Car
- Weight
- 16.5 pounds
This XXL soft-shell roof bag offers 40 cubic feet of storage in a 72 by 48 by 20 inch footprint. It uses 840D vinyl for waterproof protection and includes a full mounting kit with straps and hooks. You can install it on vehicles with or without existing roof racks. It weighs 16.5 pounds and comes with a carry bag for compact storage when not in use.
Pros
- 40 cubic feet of cargo capacity
- 840D vinyl shell with waterproof zippers
- Mounts to vehicles without crossbars
- Includes roof mat and carry bag
Cons
- Soft shell lacks rigid aerodynamic shape
- 16.5 pound weight is heavier than hard cases
- No included locking mechanism for the bag itself
Good fit if
- You need maximum cargo volume for large loads
- You want to use your current roof without adding bars
- You need a waterproof solution for wet weather travel
Skip if
- You require a rigid aerodynamic design for highway efficiency
- You prefer a lightweight carrier under 10 pounds
- You want a permanent hard shell installation
Verdict: Mockins 40 CuFt Soft Shell Roof Bag provides massive storage for families needing extra space without installing new roof racks. It suits travelers prioritizing volume and weather protection over aerodynamic efficiency.
BagMate 23 cu ft Roof Bag – 840D PVC
Best for: High-capacity storage on vehicles without roof racks
- Capacity
- 23 cu ft
- Shell Type
- 840D PVC
- Water Resistance
- 100% waterproof
- Dimensions
- 55" L x 44.9" W x 19.5" H
- Vehicle Type
- Car, SUV
- Mount Type
- Roof Mount
The BagMate is a 23 cubic foot soft-shell roof bag designed for SUVs and cars. It measures 55 inches long and 44.9 inches wide. The bag uses 840D PVC fabric with heat-welded seams for waterproof protection. It weighs 13.1 pounds and installs using door hooks without a roof rack. This option suits you if you need extra space and flexible mounting on vehicles without fixed rails.
Pros
- Generous 23 cubic feet of storage capacity
- 840D PVC shell with heat-welded seams
- Universal installation using door hooks
- Includes non-slip protective roof mat
Cons
- Soft shell offers less aerodynamic efficiency than hard plastic boxes
- Door hook installation may interfere with side-curtain airbags
- No rigid structure to protect contents from impact
Good fit if
- You drive an SUV or sedan without roof racks
- You need maximum storage volume for large loads
- You want a lightweight carrier that folds compactly
Skip if
- You prefer a hard-shell box for better wind resistance
- You require a roof rack system for mounting
- You need a carrier with a rigid protective structure
Verdict: BagMate 23 CuFt Soft Cargo Bag provides high capacity and flexible mounting for vehicles without racks. It fits buyers who prioritize volume and universal fit over aerodynamic performance and rigid protection.
Specifications side by side
| Spec | Thule Caprock Cargo Box Kit One Size | Sailnovo 21 cu ft Soft Roof Bag | RoofPax 19 cu ft Polyester Roof Bag | Asinking 20 cu ft Waterproof Roof Bag | Thule Motion 3 XL Roof Cargo Box | Mockins 40 cu ft XXL Roof Bag | BagMate 23 cu ft Roof Bag – 840D PVC |
|---|---|---|---|---|---|---|---|
| Capacity | not specified | 21 cubic feet | 19 Cubic feet | 20 cu ft | 18 cu ft | 40 cu ft | 23 cu ft |
| Shell Type | not specified | Soft Shell | polyester | 900D PVC tarpaulin | not specified | 840D vinyl | 840D PVC |
| Load Capacity | not specified | not specified | not specified | not specified | 165 lbs | not specified | not specified |
| Water Resistance | not specified | Waterproof | 100% waterproof | 100% waterproof | not specified | waterproof | 100% waterproof |
| Security | not specified | not specified | not specified | Lock | Slide lock | not specified | not specified |
| Installation | not specified | Tie-Down Strap | door hook straps, 10 straps | Metal ring strap design | PowerClick quick-mount | not specified | not specified |
| Vehicle Compatibility | not specified | not specified | fits cars with or without roof rack | With or without roof rack | Select Thule rack systems | not specified | not specified |
| Dimensions | 31.9 x 2.24 x 2.56 in | 9.84 x 7.09 x 13.8 in | 47.2 x 35.4 x 19.8 in | 52 x 40 x 12-18.5 in | 84.7 x 35 x 17 in | 72 x 48 x 20 in | 55" L x 44.9" W x 19.5" H |
| Vehicle Type | not specified | Car | Car | Car | not specified | Car | Car, SUV |
| Size | One Size | 21 Cubic Feet | 19 Cubic feet | 20 Cubic Feet | One Size | 40 Cubic Feet | XXL 23 Cu. Ft. |
| Mount Type | not specified | Roof Mount | Roof Mount | Roof Mount | Roof Mount | not specified | Roof Mount |
| Lockable | not specified | not specified | not specified | Lockable | not specified | not specified | not specified |
| Weight | 3.97 pounds | 8.16 pounds | 12.4 pounds | not specified | not specified | 16.5 pounds | 13.1 pounds |
| Color | Black | Black | ['Black', 'Orange', 'Grey'] | Black with Blue | WHITE GLOSSY | Black | Black |
| Model | 611330 | Sailnovo5033-FR | Rooftop_Cargo_Carrier | rooftop cargo bag | 11500504 | MA-RB-40BLK-72X48X20-89 | RBM-CRB |
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Frequently asked questions
Are there soft roof bags that fit under low clearance?
Yes, but you must check the height specs carefully. The Sailnovo 21 cu ft bag stands 13.8 inches tall, which is much higher than the Caprock’s 2.56 inches. The RoofPax bag is 19.8 inches high. These soft options are not suitable if you need the ultra-slim profile of the hard-shell Caprock for tight garage or garage door clearance.
Which alternative is best for cars without roof racks?
Soft roof bags are the primary choice for vehicles lacking factory racks. The Sailnovo, RoofPax, Asinking, Mockins, and BagMate options all use roof mount straps to secure to the roof surface. The Thule Motion 3 XL requires existing crossbars. If you have no racks, you must choose a soft bag like the 21 cu ft Sailnovo or the 20 cu ft Asinking.
How does the weight of soft bags compare to the Caprock?
Soft bags are significantly heavier than the lightweight Thule Caprock. The Caprock weighs only 3.97 pounds. In contrast, the Sailnovo bag weighs 8.16 pounds, the RoofPax weighs 12.4 pounds, and the Mockins bag weighs 16.5 pounds. The BagMate is 13.1 pounds. If minimizing roof load weight is your priority, the Caprock remains the lightest option by a wide margin.
Can I get more storage volume with a similar brand?
You can get more volume with Thule, but the product changes. The Thule Motion 3 XL offers X-Large capacity, which is far larger than the Caprock’s compact size. However, it is a different model line. Other brands like Mockins offer 40 cu ft, and Asinking offers 20 cu ft. These are soft bags, not hard shells like the Caprock.
Is the Thule Caprock still the best choice for small loads?
The Thule Caprock remains the top pick for small loads on low-profile racks. Its compact dimensions of 31.9 inches by 2.56 inches make it ideal for minimal storage needs. Other options like the Sailnovo or RoofPax provide much larger volumes but lack the slim, rigid protection. If you only need to carry a few items and have tight clearance, the Caprock is unmatched.
Do any alternatives offer lockable storage without a hard shell?
Yes, the Asinking 20 cu ft bag is listed as lockable. This allows you to secure contents without a rigid plastic shell. The RoofPax and Mockins bags are also soft carriers but do not have lockable features listed in their specs. If security is important but you lack roof racks, the Asinking bag provides a lockable soft option.