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Which side is the back of the schoolbag? Mathematics in the first grade of primary school.
The back of the schoolbag is the side attached to the back.

A schoolbag refers to a bag made of cloth, leather, etc. Students use it to pack textbooks and stationery.

According to the change of consumers' aesthetic taste, schoolbags have developed a kind of schoolbags which can reduce students' burden. The materials of luggage are more diverse. Leather, PU, polyester, canvas, cotton and linen bags keep up with the fashion trend. At the same time, in the era of more and more flaunting individuality, various styles such as simplicity, retro and cartoon also cater to the needs of fashionistas to publicize individuality from different aspects.