The Rightline Gear Sport 3 Car Top Carrier is one of the largest car top bags on the market and aerodynamically designed to help save $$$ at the gas pump. The carrier is 100% waterproof, unzips 3/4 of the way around for easy loading, and attaches to vehicles WITH or WITHOUT a roof rack. Connect the carrier's straps to a roof rack, run them through the vehicle, or add the Rightline Gear Car Clips (purchased separately) to attach them to the vehicle's door frame. Capacity: 18 cu ft Dimensions: 48" L x 40" W x 14-19" H 100% Waterproof with Dual Seam Technology - Sewn for Strength/Welded Waterproof Aerodynamically designed for SUV's and minivans, WITH or WITHOUT a roof rack PVC Mesh (nylon re-enforced PVC) and Hydrotuff Material (PVC-backed polyester), UV resistant ZipRight System; a urethane coated zipper located on the protective flap keeps water out Includes: carrier, (4) nylon straps, stuff sack, and a sewn-in set up guide This product ships in approximately 1 days