Roswheel Bike Saddl Seatpost Bag Fashion Fixed Gear Fixie Black Practical New (Red) Materials:600D Dacron PVC. Volume:Approx 1.0L. Dimension:Approx 15.5 x 9 x 8cm/6.1 x 3.5 x 3.1". Color:red Weight: Approx 107g.