The rooftop cargo bag instantly adds 15 extra cubic feet of cargo space right on the roof of your vehicle. The bag has a PVC lined interior, 4 adjustable straps with 8 side-release buckles, 8 non-slip rubber pads and a heavy duty zipper with protective flap. Made from PVC coated polyester. Easily folds flat for easy storage and it is also waterproof! Measures 38" x 38" x 18".