Every feature of the Rightline Gear Sport 1 Car Top Carrier is designed with you in mind, from its 100% waterproof construction to its engineered Car Clips, which can be attached or removed for use WITH or WITHOUT a roof rack. In just a few steps, you can attach the carrier's straps to a vehicle's roof rack or use the Car Clips to attach the straps to a vehicle's door frame weather molding - the only revolutionary solution of its kind that WILL NOT interfere with passenger headroom. The bag's aerodynamic shape further reduces wind resistance to promote a quieter ride, all while saving you $$$ at the gas pump. Traveling long distances? No problem. The Sport 1's UV protected PVC Semi-Coated Mesh XT shell, welded seams, urethane coated zipper & zipper flap provide a durable, 100% waterproof barrier from the elements. With 12 cubic feet of rooftop storage, you can transport your cargo and your passengers without compromising safety, comfort, or convenience. All Rightline Gear products come backed by a 1 year manufacturer's warranty, so Gear up with confidence! Spend less time dealing with overpriced and overcomplicated alternatives, and more time doing what you love with a Rightline Gear Car Top Carrier.