Backpacks (or simply backpacks)
Backpacks are a general term for bags worn on both shoulders. The most obvious characteristic is the two straps on the back for fastening to the shoulders. They are commonly used by students. Depending on the material, they can be divided into canvas bags, Oxford cloth bags, and nylon bags. The main advantage of backpacks is their convenience, freeing up the hands and providing convenience when going out.
Single-shoulder backpacks
Single-shoulder backpacks, as the name suggests, are backpacks that bear the weight on only one shoulder. They are further divided into single-shoulder bags and crossbody bags. Single-shoulder backpacks are generally smaller in capacity and easy to carry. They are not suitable for use while going to school, but can be used while shopping, so they have gradually become a fashion item. The main consumers of single-shoulder backpacks are young people; however, when using a single-shoulder backpack, one should pay attention to the load on one shoulder to avoid uneven pressure on the left and right shoulders, which may affect physical health.
Electronic backpacks
Electronic backpacks are a derivative of the concept of backpacks. Originally, they generally referred to a service function offered to members by certain novel and literature reading websites.