product manualMaterial: nylon bagInternal structure: ID bag, mobile phone bag, interlayer zipper bag, zipper bag, computer bag Opening method:zipperFunction: waterproof, breathable, wear-resistant, anti-theft, decompression, shock-proofProduct size: Large: 41 31 20CMSmall: 38 29 17CMThe internal multi-functional design, the elements are clearly divided, and the learning efficiency is easily improved. Small objects such as mobile phone stationery boxes, books and various small learning objects can be placed. Develop the habit of keeping your child safe from an early age.Choose a high-quality water-repellent fabric that prevents water droplets from remaining, so as not to leave dirt, and wipe it gently with a paper towel.S-Shaped Straps: Ergonomic Designer Adjusts and Corrects Multiple Times. Get a comfortable and stress-relieving shoulder strap design. This paragraph is made of high-quality elastic cotton, which is strong and flat, and is not easy to deform Using high-quality high-quality slider, high metal thickness, not easy to wear, comfortable texture, comfortable to use.