There are generally two kinds, one on the back and the other on the shoulder. Now there are wheels that can be towed, which can play a decorative role. The schoolbag can hold books and stationery. The main advantages of backpacks are easy to carry, free hands and provide convenience for going out. One-shoulder schoolbags are generally small in capacity and easy to carry. It can be used not only in school, but also in shopping, so one-shoulder schoolbag has gradually become a fashion.