Never used. Box is a little broken because of the move. REUSABLE SILICONE STORAGE BAGS - Food grade silicone material, BPA Free, material one-piece molding - no breaks. Silicone Milk Storage Bags are an alternative to disposable milk storage bags that can save you more money every year. MULTIFUNCTIONAL COMPATIBLE STORAGE - Momcozy silicone milk storage bag can store liquid, mushy food, such as juice and rice cereal, puree, ect. You can also easily turn it into other storage bags, as well as ice packs or hand warmers. KNOB CAP DESIGN - Strong seal, easy to pour milk from breast pump, 100% no leak. The momcozy silicone milk storage bag can be stored in the refrigerator and freezer, flat or upright, saving space and keeping it neat.