1.DIMENSION: The pocket size: 22*14cm, there are 2 pockets for you to carry what you need for running, weight only 220g, very lightweight, making your running comfortable.2.CHARACTERS: Multiple suspension system, you can hang the key and other things that need to take away. The bright reflective design serves as a warning to people and drivers. Customized zippers, exquisite quality, smooth pull and durable. Multiple adjustable parts to meet the needs of different heights.3.THE BACKAdopting the technology luminous elements, the reflective effect will enhance at night or in dark places , getting the notice of drivers and the people walking, providing security for your nighttime travel.4.CAPACITY: Small build, large capacity. It can accommodate daily necessities, such as wallet, bank card, glasses, mobile phone, etc.