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Ingeneral, the space of reusable bag is constant. Sometimes when there is too many things, it is has to separated into two bags and big bags is not convenient to carry.
Flexible reusable bag have a extra space help you to put more things. Just upzip the zip and extand the bag, the hidden inlayer can enlarge the space.Besides, the pattern on the bag may bring you more fun.
Guangdong university of technology
Zebin Chen Jianying Zhu Danqing Li Yongqiang Feng