This is the rooftop carrier constructed of weatherproof coated PVC that expands storage by 15' cu. for vehicles with or without an existing roof rack. Made from UV-protected PVC semi-coated polyester mesh with welded waterproof seams, the carrier has a waterproof zipper that does not require a zipper flap, thanks to a welded construction technique that conceals the zipper and prevents overfilling. Secures to a car’s rooftop rack or (for cars without a rack) with four attachment straps, four car clips. Also comes with a non-skid pad that keeps carrier from sliding on a car roof. Includes stuff sack with sewn-in installation guide.