Structure: this is a small backpack (23 x 38 x 10 cm), but can hold all items. The main compartment features an inner pocket, a front zip pocket and a side mesh pocket. Enough to carry the essentials such as phone, keys, cards, paper towels, wallets, snacks or other small items. Comfortable to wear: ultra-light (400 g), soft back and wide shoulder strap, can be worn on the cross and on one shoulder, waterproof zip design for autumn and winter. Small appearance and stylish layout design are a good choice. Hang the glasses ring on the shoulder strap: you can hang the glasses for easy carrying. Adjustable strap with buckle: you can easily and easily adjust the length of the backpack strap as needed. It is no problem to remove it from the backpack. The adjustable padded single shoulder strap makes this bag suitable for most people. Non-slip and breathable: ultra-light material, tight design, breathable spongy material on the back, greater friction, strong stability, not easy to shake during training. Comfortable and breathable, effectively absorbs sweat. Perfect for your outdoor sports activities, a good choice for travel, hiking and mountaineering. The back method can be switched from left to right, is comfortable, waterproof and easy to clean. This bag is made of special nylon material, very strong, easy to clean, color stable and extremely hydrophobic.