Maximum capacity boxes have room for plenty of extra gear. Dual-side opening for easy loading/unloading from either side of the vehicle. SecureLock™ helps ensure that all gear is locked and box is properly closed prior to driving. Four sizes available to fit your cargo carrying needs: X-Large, Large, Medium and Small. Racks and Carriers by Thule - Cargo Box, Rack-Mounted, X-Large, 84" x 35" x 17"