1.This backpack is the ideal choice for people who practice cycling, jogging or climbing. The bag is lightweight, made of high quality nylon, waterproof, tear-resistant, wear-resistant and practical. 2.The bag adopts U-type zipper design, opening big.The shoulder strap and the back of the bag containing the bulges thickenings. The breathable sponge allows the air to flow from the top and drains to the bottom and around. Adjustable straps make it perfect for every person. The belt is used to relieve stress and ensure a stable and safe ride. The chest clips help to tighten the backpack against your body, and so it does not shake violently. 3.Structure: 1 main compartment with open pockets. there is another compartment inside, is the place for the water bag. It is also a bag in the middle in net. Inside: 1 bag outside right, you can easy to take objects during your trip. There is a large hole in the top at the back to attach the water pipe and to connect the water bag. (Note: this bag does not contain water bag, if you need a water bag, please buy separately.) 4.Reflective straps for a secure ride in the night. The practical design, a neat finish and beautiful colors make it more modern and provides you with a great traveling companion. 5.Suitable for all outdoor activities such as cycling, hiking, traveling, etc. This backpack is a faithful companion for your travels and your sports.Note: the water bag, the umbrella, cell phones and the camera are not included in the order.