Rightline Gear Sport 3 Car Top Carrier- The Sport Carriers' ZipRight System locates a urethane coated zipper on the protective zipper flap, preventing rain water from entering the carrier. Other roof top carriers feature a standard zipper located where the zipper flap meets the bag, allowing rain water to enter the carrier. The carriers are constructed from UV protected PVC Semi-Coated Mesh XT and Hydrotuff using Dual Seam Technology. The materials are sewn together for strength and then welded along the stitching to make the seam waterproof. The end result is a highly durable cargo bag that lets you travel with the peace of mind that your gear will stay dry. After use, the Sport Carriers fold down for storage in a stuff sack, complete with a sewn in set up guide. All of the Sport Car Top Carriers are aerodynamically designed to save $$$ at the gas pump. Use the carriers on your next family vacation, backwoods expedition, shopping spree or move. Capacity: 18 cu ft Dimensions: 48 L x 40 W x 14-19 H inchs Aerodynamically designed for SUVs and minivans, WITH or WITHOUT a roof rack 100% Waterproof with ZipRight System, urethane coated zipper, and Dual Seam Technology Includes: Carrier 4 Attachment straps 4 Car slips Stuff Sack with sewn-in set up guide