KLOUD City Black expandable seat saddle bag with reflective trim for cycling bike bicycle Material: Polyester-highly tear and water resistant cloth Attaches under your seat with two secure straps; U shape PE board inside makes the bag expandable Light holder belt can hold your bike light on this bag Anti-skidding zipper design and reflective trim can secure cycler Dimensions (L*W*H): 5.9*3.7*3.9 inches/1.0 to 1.6 L; Weight: 5.02oz