Wide hook and loop belt fits all sissy bars. Can be mounted on luggage rack or rear seat to provide lumbar support for rider. Heavy duty 1200 denier fabric. Each end compartment expands by 1.5 inches for extra storage. 3 compartments feature waterproof zippered ends and large main hatch for easy accessability. Semi-rigid design that will maintain its shape empty or full. Measures 12 inches in length - 11 inches high and 21 inches wide - expanding to 24. External d-rings allow extra items to be bungeed to outside of bag. Bag includes universal mounting straps - convenient shoulder strap - and rain cover.