Maximum-capacity box has room for plenty of extra stuff. Dual-side opening for easier loading/unloading from either side of the vehicle. Quick-Grip™ mounting system for fast, easy, tool-free installation and removal. SecureLock™ ensures that all gear is locked, and box is properly closed prior to driving. 2 One-Key™ locks secure box contents and lock the box to the roof rack. Racks and Carriers by Thule - Cargo Box, Large, Roof Mounted, Force XT, 74" X 36" X 16.5"