Easy to hang up to school. Not only does it keep your beloved backpack clean for a long time, it can also store gymnastics clothes, lunch bags, drawing tools, and other items that cannot fit into the backpack. Whats more, it reduces the weight you feel on your body. It is also considered to be safety and crime prevention. Your child can easily climb and school with peace of mind and safety. Two tiers and storage pockets in the back can store gymnastics clothes, lunch bags, drawing tools, etc. Optional connection / Comes with safety buckles. Can be attached to the side of the shoe pocket (sold separately), lunch pouch (sold separately) and more. The weight reduction function makes the backpack lifting the shoulder belt and keeping it close to the body to reduce the weight you feel on the body. Reflective tape included for traffic safety and reflective tape to reflect car headlights for increased visibility. (Security Sign) Includes a safety manual (English language not guaranteed) The back cover of the safety contact book attached to the transparent pocket is a security sign. Uses polyester water-repellent material; Material: Outer Fabric: 100% polyester; Transparent part: EVA. *Cannot be used with special shaped backpacks such as short lids or horizontal backpacks.