The function of this zipper is to prevent children from opening the zipper by mistake. The ordinary zipper usually opens the zipper in a symmetrical way. This zipper bag can not open the zipper in a symmetrical way, so it can effectively prevent children from opening the zipper at will, especially the products not for children to eat. It is mainly used in packaging equipment, capsule medicine, tobacco and other industries. Product features: 1. Special bone: thickened bone, children's design. 2. Self supporting bottom: self supporting bottom design, more beautiful. 3. Even edge sealing: Design of line pressure to prevent edge burst.