DURABLE, NO-LEAK MATERIAL – BPA-free, reinforced, no-leak material means you won’t need to worry about tears or holes in your breast milk storage bags. And the double zipper securely seals milk inside the pre-sterilized bag. SIX OUNCE CAPACITY – Store up to six ounces (180 ml) of breast milk, and keep track of your stash with accurate measurement markings and a write-on label. CONVENIENT DESIGN – Our breast milk storage bags feature a flat bottom so they can stand up for easy filling. Then, lay them flat for compact storage in the fridge or freezer. PRE-STERILIZED, HYGIENIC BAGS – These milk storage bags for breastmilk are pre-sealed and pre-sterilized so they are ready for immediate use. Rest easy that milk is stored in food-grade, BPA-free disposable milk storage bags. PUMPING MOM ESSENTIAL – These convenient, cute breast milk storage bags are a nursing mom must-have. These bags are easy to use, transport, store, and warm, and they’re compatible with all major breast pump brands.