The SportRack SR7011 Horizon Roof-Mount (11 cubic feet) Cargo Box Black expands your vehicle s storage space while traveling. Constructed of rugged impact resistant ABS plastic this durable cargo box offers 11-cubic feet of storage space passenger side-openings and a secure centralized lock for easy opening and closing. The cargo box mounts directly to most roof racks including SportRack Roof Rack Systems square round and most factory racks and includes the Quick-Release attachment kit for easy installation and removal.