The phrase "dual zipper" means that there are two zippers on something, like a bag or a jacket, that can be opened and closed independently of each other. Full definition
A built - in loop can hold a stylus, while there are dual zippers for easy access. (tabletroms.com)
- Comes in a pack of 8 - Has strong dual zipper, so no leaking - Extra-wide opening makes them easy to fill - Over 50 uses per pouch (tinyfry.com)
2 - pack of the same characterFor purées, smoothies, applesauce and moreSecure top opening with no - spill, dual zipper closureLarge, no - swallow cap with tetherCapacity: 6 oz / 177 mlBPA - free, phthalate - freeDishwasher safe and freezer safe (themagicbeantoyshoppe.ca)