Why does the weight increase a lot after changing into Leyifan box?

Since most of package box from Japanese websites are really weak. We provide for you a high quality thickening package box. ‍Only 300 JPY each box.‍

Leyifan 3 types of boxes:

Type A: 1.3 kg

Type B: 1.6 kg

Type C: 2.5 kg

Contrast between Leyifan box and Amazon JP box: 

1. Amazon JP box: only 1.05 kg，weak and easy to be damaged.

2. Leyifan thickening box (same type with Amazon JP box): double-carton and strong, 2.5 kg