CargoSmart Soft Sided Car Top Cargo Bag 38x38x18 - Adds Extra Storage

Our review of the CargoSmart Soft Sided Car Top Cargo Bag finds it best for drivers who need a straightforward, weather-resistant way to add storage for weekend trips, camping, or sports gear. The single biggest reason to buy is the practical combination of size and mounting options: at 38 in x 38 in x 18 in it delivers up to 15 cu ft of extra room and can be mounted on a bare roof, roof rack, or rooftop basket, making it a flexible option for cars, SUVs, vans and RVs. This review focuses on real-world usability rather than marketing claims.

Key Features

• Up to 15 cubic feet: Frees up interior and trunk space so teams, families, or travelers can carry more gear without cramming the cabin.
• Universal mounting: Attaches to bare roofs, roof racks, or rooftop baskets with included straps for broad vehicle compatibility.
• Heavy-duty vinyl construction: Resists wear and tear during loading and transport so the bag stays usable across multiple trips.
• Protective zipper flap: A covered heavy-duty zipper helps reduce dirt and moisture intrusion at the closure point.
• Folds flat for storage: Collapses down when not in use so it does not take much space in a garage or trunk.

Who It's For

The CargoSmart bag is ideal for occasional to frequent travelers who need an inexpensive, easy-to-install soft cargo solution for camping, weekend trips, or sporting events. It suits owners of cars, SUVs, vans, and RVs who want up to 15 cu ft of extra space without permanent racks.

It is less appropriate for users who require guaranteed watertight protection in extreme conditions or heavy commercial hauling; a hard-shell carrier or purpose-built waterproof rooftop box is a better match for those needs. Also, buyers wanting a premium lifetime warranty and metal-reinforced frames should look elsewhere.

Pros & Cons

Pros

• Generous storage capacity that frees up passenger and trunk room for long trips.
• Versatile mounting that works on bare roofs, roof racks, and rooftop baskets with included straps.
• Sturdy vinyl build and a protective zipper flap that improve durability and reduce dirt entry.

Cons

• Water resistance is mixed in customer experience, so it may not be fully waterproof in heavy or prolonged rain.
• Zipper quality has received mixed feedback and could be a point of failure under heavy use.

Specifications

Dimensions	38 in x 38 in x 18 in
Storage capacity	Up to 15 cu ft
Material	Heavy-duty vinyl
Closure	Heavy-duty zipper with protective flap
Mounting	Straps for bare roof, roof rack, or rooftop basket
Storage when not in use	Folds flat

Our Verdict

The CargoSmart Soft Sided Car Top Cargo Bag is a practical, value-focused option for drivers who need extra storage on road trips and outdoor outings. It offers flexible mounting, solid capacity, and a rugged vinyl shell that performs well for general use, but buyers seeking guaranteed waterproofing or premium zipper longevity should be aware of mixed reports and consider alternatives if those are top priorities.

Frequently Asked Questions

Will this bag fit on a bare vehicle roof?
Yes. The bag is designed to mount to bare roofs as well as roof racks and rooftop baskets using the included straps.

How much extra space does it provide?
The bag provides up to 15 cu ft of additional storage and measures 38 in x 38 in x 18 in.

Is it fully waterproof?
It features a protective zipper flap and heavy-duty vinyl for weather resistance, but customer feedback on waterproofing is mixed, so it may not be completely watertight in prolonged heavy rain.