Nelson-Rigg GWR-1000 Black Rear Rack Pak Luggage/Seat Bag Made from top quality UV-treated Tri-Max ballistic polyester, the semi rigid construction helps bag hold its shape even when empty, large external pockets expand to twice their capacity Two additional pockets are located within easy reach of the passenger, strategically placed rivets add long-term strength and reliability Two metal D-rings allow items to be tied to bag, if necessary, mounts to most top box luggage rack Includes waterproof rain cover and security lock Main compartment measures: 20 inch length x 11 inch width x 11 inch height, holds 39.66 liters