The materials for making clothes are different from those for making backpacks. The materials for making clothes are very soft, knitted, and the lines are very delicate. The fabrics for making backpacks are relatively rough and rigid. If the fabrics for making clothes are used for making backpacks, it will be difficult because there will be many processes. For the different machine, the final product lines will not look good, and the whole backpack will not keep the shape, always soft and prone, so you need not only rough materials to make backpacks, but also a lot of things to hold inside, so that all parts of the backpack are more rigid and keep shape.