Thule 687B Atlantis 1800 Rooftop Cargo Box (Black) Solid ABS construction; installs in seconds with QuickGrip mounting hardware Access gear from either side of the car using dual side-opening feature Mounts to most removable and factory-installed racks 18 cubic foot capacity; measures 84" long by 34.4" wide by 16.9" high Thule's most popular selling cargo box