Quality you can trust. Lansinoh makes breastfeeding easier with their breastmilk storage bags that can be easily stored or frozen for later use. Pre-sterilized bags allow for direct pumping into the bag using a Lansinoh pump, and have a patented double zipper seal to prevent spills and leakages. Besides being the strongest milk storage bags with reinforced side seals, Lansinoh storage bags lay flat or stand upright for a more efficient space storage. A convenient pour spout at the top of the bag offers easier milk transfer into baby bottles. IMPORTANT! Ensure your Lansinoh Breastmilk Storage Bags have white and purple flowers and a white line above the logo. If your bags do not have this design, it is not compatible with pumping directly into the bag.