Product introduction: The appearance is compact and suitable for carrying more items in short-distance sports. LED makes you .There is a space in the bag, which can put clothes, water bags, and a built-in zipper bag, so there is plenty of space.The outer pocket of the bag can hold mobile phones and other personal items for easy access.After the first adjustment, it only takes 1 second to buckle the central deduction-cut on the back and finish it. Simple and fastColour:BlackMaterial:PolyesterSize:38cm x 27cm x 8cmPackage Contents:1* Cycling water bag backpackOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.