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Bag in bag is a kind of package which can be used to collect the shell when you are eating nuts. It can keep people from littering the ground with nut shell no matter if there is a trash can. It is made of recycled paper. If it is widely used, it can make a great contribute to the environment.
Sichuan University
Chengdu, China
Sichuan University
Chengdu, China
Han Xiaoxiao, Yuan Min, Wu Junzhou, Jiang Cong
