Lansinoh Breast Milk Storage BagsnPack of 50nBpa freenFor freezing and storing breast milknLeak proofnLansinoh Breastmilk Storage bags have been developed specifically for the freezer, and when stored flat, take up less space and defrost quicker. The medical grade bags are produced without using plasticisers, meaning there is no risk of any harmful substances leaking into your breastmilk.