The SportRack Vista XL is a rear-opening rooftop cargo box that provides 18 cubic feet (510 L) of storage space and can mount to virtually any type of roof rack. 18 cubic foot (510 L) internal cargo capacity Made from durable UV-resistant ABS material Rear opening for easy access away from traffic Tool-free mounting hardware for easy installation and removal Includes key and lock to secure contents in the box, and the box to your rack Fits SportRack Rack Systems, square bars, round bars and most factory racks (check fit guide) Dimensions (LxWxH): 63 x 38 x 19 in / 160 x 96.5 x 48 cm Min-Max Crossbars Spacing: 23 5/8 - 29 3/4 in (60 - 75.5 cm) Max Weight Capacity: 100 pounds (45 kg) MODEL NO - SR7018