Nelson-Rigg CTB-950 RiggPak Black King Tourer Luggage/Seat Bag Made from top quality UV-treated Tri-Max ballistic nylon, the bag utilizes the innovative universal "Full-Nelson" mounting system, and can sit on a luggage rack or passenger seat when mounted to a backrest or sissybar Fully lined interior with rigid construction to hold bags shape when empty; included roll bag can be mounted separately; integrated pocket conceals straps turning your bag into a backpack Four large easily accessible side pockets (2-expandable), detailed office organizer and envelope-sized pocket, security loops under bag allow a cable lock to be installed (cable not included) Larger mounting system for wider curved backrests; fold-out rigid plate prevents bag from sagging when expanded, includes waterproof rain cover and security lock Main compartment measures: 14 inch length x 8 inch width x 18 inch height unexpanded, 14 inch length x 10 inch width x 18 inch height expanded; roll bag measures: 13 inch length x 9 inch diameter; dimensions for both bags