EASY STORAGE: Ameda's breastmilk storage bags are refrigerator and freezer friendly. With the ability to store flat or upright in the freezer, these breast milk bags help save valuable space. SUPER STRONG: Our breastmilk bags are designed with reinforced side seams and a double zip seal to prevent breast milk leakage during storage and transportation. PUMP DIRECTLY INTO BAGS: Save time by pumping breast milk directly into the milk storage bags with our easy to use milk storage bags adapters (sold separately). SAFE: Ameda's breast milk storage bags are BPA free with a tamper resistant feature. Our milk bags are pre-sterilized and ready for use. CONVENIENT: With a high-quality design and 6oz capacity, these bags offer ample space for breast milk storage. Each bag also has a write-on label area to keep track of vital information.