Ideal for storing and freezing breastmilk #1 selling milk bags for breastfeeding in the US BPA-free and BPS-free bags have reinforced side seals. Lansinoh Breastmilk Storage Bags are uniquely designed for moms to save time by pumping directly into the storage bags. Moms love the convenience of Lansinoh Breastmilk Storage Bags. They stand up for easy refrigerator storage and lay flat for space-efficient freezer storage. Nursing mothers have trusted Lansinoh for more than 30 years to provide safe and effective products to make breastfeeding easier. Moms can pump directly into the breast milk bags using a Lansinoh pump or attach the Lansinoh pump adapter to pump directly into many other common pump brands.