Ogio S3 EXPANDABLE 4-7L TANK BAG - Ram MountThe S3 is a 4L tank bag with a 2. 5 expansion joint that allows the bag to expand and store up to 7L of volume. Made from single shot molded PU with Carbon Fiber graphics, this bag is water resistant, features a see through phone window, power cord port, internal removable storage pouch and shoulder strap. A flexible bag for the daily commute. Features: Single shot molded PU exterior is water resistant and will not deform from wind shear Both top and