The Sport Star soft bag is made of a robust Cordura fabric. This bag offers a flexible attachment and is specifically designed to fit onto the passenger seat. A zipper and compression straps offer a variable capacity. Please Note: The bag will not fit on the Hepco & Becker rear rack for the R NineT with the rear cowl found on the Racer model. Other models with a similar design may also have a compatibility issue. Dimensions: 35 x 35 x 18/25cm. Capacity: 18-28L. A rain bag is available under part number 700.406