SUPER STRONG- Designed with double sealed side seams and a double zipper to protect and freeze breastmilk, SAFE BREASTMILK STORAGE- Our storage bags are presterilized and BPA/BPS free with a tamper-evident, fully sealed tear-away top for safety, SAVE TIME- Pump directly into the bags using your Lansinoh pump or most major pump brands using our Lansinoh pump-into-bag adapter (sold separately), EASY TO USE- Each bag has a large write-on label at the top plus a convenient pour spout, COMPACT STORAGE- Lay flat to safely freeze; Stand in the fridge for compact, easy storage