Capacity 13 cubic feet; Dimensions 40 inches lenth x 20 inches width x 28 inches height Rear vehicle mounting for easy loading and access to your gear, with or without a roof rack; patented design produces no aerodynamic drag and saves dollars on gas 100 percent waterproof with welded seams and urethane coated zipper; PVC mesh, a nylon re-enforced PVC, and Hydrotuff material, a PVC-backed polyester, UV resistant Attaches to SUVs, minivans, and crossovers with a roof rack either side rails or cross bars ; install on vehicles without a roof rack with Cargo Saddlbag car clips purchased separately Bottom pole frame provides structure and rigidity for the bag; includes Cargo Saddlebag, base frame, 1 2 inch width belt strap, 2 1 inch width bottom straps, stuff sack and sewn-in set up guide