Zomee milk and formula bags are super thick, durable, and resilient so you won’t have to worry about leaks or spills. Made with a double layer of food-grade plastic and a double zip locking seal at the top, for easy storage in the fridge or freezer. Sturdy enough to stand on the counter to fill or empty without spills or losing a drop. I have 2 unopened 100 count packs and 1 unopened (but not used) 100 count pack that will not come in original packaging as shown in the first photos. See last picture for reference.