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