Lansinoh's #1 selling Breast Milk storage bags are ideal for storing, freezing and protecting precious Breast Milk. Built super strong, Lansinoh bags come with a double zipper seal to prevent leakage and reinforced double sealed side seams for ultimate protection. Presterilized for safe storage plus BPA and BPS free. Easy to use and saves time by pumping directly into the bag. Gender: unisex.