There are two types of trolley schoolbags, one is a one-piece trolley schoolbag, and the other is a universal trolley schoolbag.

First, the benefits of the universal trolley bag:
1. Compatible with many kinds of schoolbags, any schoolbag will instantly become a trolley schoolbag when placed on it, and your own schoolbag can be used.
2. Imitating the action of the human body backing the schoolbag, it is not convenient to disassemble, and it can be loaded and unloaded in seconds.
3. Very strong and durable, with a lifespan of 3-5 years.
4. The chassis is also reinforced with gold square tubes.

Second, the defects of the one-piece trolley schoolbag:
1. It is inconvenient to disassemble.
2. A fatal flaw is that when you are pulling and climbing the steps, the steps will grind the back of the schoolbag, and the schoolbag is easy to get dirty. After the rain and snow, the schoolbag will be dirty.
3. The steps are easy to damage the schoolbag.
4. The lifespan is short. This kind of trolley schoolbag is generally broken after three or five months of use.
5. A special schoolbag must be used. If the schoolbag is broken, the whole trolley schoolbag cannot be used.