This bicycle backpack by OUTDOOR INOXTO is made out of waterproof polyester and polyester lining material. The bag was created to be as aerodynamic as possible, it can also be tied very tight to your back due to the adjustable straps. On the back of the bag, you will find adjustable elastic strings to tie everything down. The main compartment of the bag is spacious. There is a smaller compartment on the back which is easily accessible to store any essentials, and is closed by a zipper. There is a convenient outlet for the tube of your water bag on the shoulder strap.  You will find two pockets on each of the shoulder straps where you can safely store your phone, water bag or snacks for easy access while cycling. Not only that, but there are two handy zipper pockets on both sides of your waist. Both of the shoulder straps and the waist zipper pockets can be tied together at the front so the bag can fit extra tightly. At night, the bag will light up with reflective bands on the two shoulder straps.  TypeCycling backpackClosing typeZipperShapeSatchelMain materialWaterproof PolyesterLining materialPolyesterPatternSolidStyleSportsHardnessSoftDimensions40 * 25 * 9 cm