Rigid EVA foam and 600 denier polyester construction Features a divided main compartment with 2 side pockets and rear facing bottle holder Integrated straps are compatible with all rear racks Shoulder strap and carrying handle included Bungee top for carrying loose clothing or rain jackets Velcro Straps 14.2x8.3x7.5` 480 c.i. Black X-Large (301-500 c.i.)