1. First, fasten your belt and tidy it up. Look for two iron rings on the belt, one is long and the other is short. First, pass one end of the belt through two rings at the same time.

2. Then separate the two iron rings. After opening the two iron rings, bypass the short one and wear it back from the long one. Open the small ring with the other hand, pull one end of the belt with one hand and fix it with the iron ring with the other hand.

3. Tighten the belt with both hands at the same time. If it is tightened, the length of the schoolbag can be adjusted like a schoolbag strap, which is very convenient and simple.

Pay attention to the style of the belt you choose. It is recommended to choose the material of soft leather or soft cloth, so as not to make the waist and stomach uncomfortable in normal wear.