塑料袋装食品以其独特的优点风靡世界。但是,我们在食用袋装食品时,常会遇到一个问题:一次吃不完一袋食品时,还得找根绳把开口处扎紧,以起密封作用。食用袋装奶粉时,这个问题尤为突出,使人颇觉不便。本文介绍的这种包装袋只是在普通包 Plastic bags of food with its unique advantages swept the world. However, we often encounter a problem when we consume sacks: once we have eaten a bag of food, we have to look for the root rope to tighten the opening to seal it. When eating bagged milk, this problem is particularly prominent, people feel quite inconvenient. This article describes this package is only in the ordinary package