Waterproof Roof Cargo Bag — 21 cu ft

A 21 cu ft waterproof roof cargo bag that turns the roof into a second trunk for road trips

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Price

Check price at eBay

Listing checked Oct 21, 2026

Fitment listed for specific vehicles

21 cu ft waterproof roof bag per the listing; verify attachment method for your roof setup.

Why FMPR included it

Picked because the roof bag is the cheapest cargo capacity a driver can buy, and this one carries eBay's own Best Seller badge into the Road Trip shelf.

How FMPR picks products

Best for

Families and hunters whose cabin and bed are full before the cooler and bags even come out.

Skip this if...

Skip it if you already run a bed cover or cargo carrier that swallows the same load.

What it is not

This page is not a hands-on test, a current-price claim, or a guarantee that the product fits your exact vehicle.

Check the current eBay listing

eBay and the seller control price, tax, stock, variations, shipping, returns, and final compatibility information.

Check price at eBay

FMPR is a member of the eBay Partner Network. We may earn a commission on qualifying purchases made through links on this page.

Listing details last checked Oct 21, 2026

The selection boundary

This listing is included for its documented use context. It is not a hands-on test, best-price claim, rating claim, or performance guarantee.

What to know

Roof bags need a plan for attachment — confirm whether your vehicle has rails/crossbars or needs the door-hook method on the listing, and pack soft goods up top, hard gear below.

Compatibility / use

21 cu ft waterproof roof bag per the listing; verify attachment method for your roof setup.

Research notes

Useful context before you click.

A 21 cu ft waterproof roof cargo bag that turns the roof into a second trunk for road trips. eBay and the seller control final variations, price, availability, checkout, shipping, fulfillment, and returns.

Why it earns a spot

Carries eBay's Best Seller badge in its gallery at sourcing
21 cu ft is family-vacation size, not duffel size

The trade-offs

Adds wind noise and a small fuel-economy cost at highway speed
Not a hard-shell vault — do not fly it with valuables visible at stops

Specs that matter

Capacity: 21 cu ft
Badge: eBay Best Seller at sourcing

Verification note: eBay listing captured live 2026-10-21: 21 cu ft waterproof roof cargo bag carrying eBay's Best Seller badge in the gallery at sourcing. eBay and the seller control current price and availability.

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