SUPERIOR STRENGTH & STRETCH - Lansinoh's breastmilk storage bags are designed to expand with your milk as it freezes, for stronger, more reliable milk storage. FAST FREEZE & THAW DESIGN – Lansinoh breast milk storage bags freeze flatter than leading competitors so you can store more breastmilk and thaw super-fast. Efficient and uniform thawing protects your breastmilk nutrients! SAFE BREASTMILK STORAGE - Our storage bags are pre-sterilized, made without BPA or BPS, and designed with a tamper-evident, fully sealed tear-away top for safe milk storage. SUPER STRONG & DURABLE - Each Lansinoh milk bag for breastmilk has reinforced double sealed seams on the side and bottom, plus double zipper for ultimate protection. SAVE TIME - Pump directly into the bags using your Lansinoh breast pump or most major breast pump brands using our pump-into-bag adapter (sold separately) and your pumping bra. COMPACT STORAGE - Lay flat to safely freeze and maximize milk storage; Stand in the fridge for compact, easy storage, or pour into baby bottles. Lay flat design helps optimize space inside breast milk storage bags freezer.