The S1 is a fixed 4L tank bag with a 600D polyester top and features a bottom made of a single shot molded PU with 600D polyester cover. Underlid storage and removable shoulder strap make this bag a perfect choice for packing your necessities. Single shot, 600D poly covered molded PU bottom is water resistant and will not deform from wind shear. Quick-release pull strap for fast removal. Reflective graphics for increased visibility in low light. Quick access grab handle. Removable shoulder strap for easy carrying off bike. Dimensions: 8.75"L x 7.75"H x 7.75"W / CM 22.2 L x 19.6 H x 19.6 W. Weight: 1.45 pounds / 0.65 kg. Capacity: 244 cubic inches / 4 liters.