Lansinoh breast milk storage bags are ideal for storing and freezing precious breastmilk. Breast milk bag storage can take place in the fridge or freezer. Lansinoh milk storage bags come pre-sterilized and have a patented double Click ‘n’ Secure seal to prevent leakage. With reinforced side seals and a double-sealed gusset, Lansinoh breast milk storage bags are the strongest available. BPA and BPS free.