RockBros Waterproof Mountain Bike Saddle Seatpost Bag Bicycle Rear Seat Pack Black Corduroy Material: PU Leather+Carbon Fiber+EVA Size: 167mm x 107mm x 98mm (Due to the manual measurement,the 2-3cm error is acceptable) Type: Saddle/Seat Bag The Velcro Design makes it more convenient and fashionable Features: Water Resistant