CoBean Black Silkworm reflective trim seat saddle bag for cycling bike bicycle Material: PU leather & Polyester; Silkworm shape-suitable for various cycling U shape PE board inside makes the bag expandable Well designed pocket flap can let you reach your accessories instantly Anti-skidding zipper and buckle design. There are also reflective strip and light holder belt for your safety Dimensions (L*W*H) 5.9*3.0*4.1 inches/1.0 L, Weight 3.4 oz