TBags new patent pending Universal Expandable Mounting System works with most any backrest up to 14 wide. Attractive loop with NO Velcro straps. Changing backrest No need to buy another bag,this one will fit. Standard Features Roll Bag can mount separately,Rigid design maintains shape when empty.,Luggage rack required,Roll Bag Dimensions 15 w x 10 d,Capacity: 12 cu. ft.