Hard Cargo Box carriers add additional cargo space to your vehicle. These tough, lockable, thermoplastic carriers keep cargo dry and secure regardless of the weather. Carries features a gas cylinder opening system that allows the hinged lid to open and close gently. Aerodynamic design limits wind resistance and provides sleek styling, perfect for luggage and sports equipment. For use with crossbars and/or side rails. See individual parts for more details. Do not exceed roof capacity of vehicle.