The S2 is a 4 liter fixed tank bag with a single injection-molded PU top with carbon fiber graphics and the lower part in single injection-molded PU with matte finish. This bag is water resistant, comes with a transparent window for your phone, a port for the power cord, a removable inner case and a shoulder strap. A great bag for everyday use, the S2 is packed with features to make it convenient to carry small items.