OxGord Roof Top Cargo Rack Waterproof Carrier Bag for Vehicles, 10 Cubic Feet DIMENSIONS: 34 x 34 x 16 inches. DURABLE: Constructed of 600 D-water resistant material. SECURE:Featuring heavy duty lockable zippers and camp-buckle straps for heightened security. SPACIOUS: Over 10 cubic feet of storage and attaches to the roof top racks. EASY TO INSTALL: Use the adjustable straps to attach to the roof top rack. When its not in use just fold it up for simple storage.