IDEAL BREAST MILK STORAGE: Our breastmilk storage bags are ideal for storing, freezing and protecting precious breastmilk. They come pre-sterilized with a double zipper seal to prevent leakage. #1 SELLING & SUPER STRONG: Lansinoh's #1 selling breastmilk storage bags are built super strong, with a double zipper seal to prevent leakage and reinforced double sealed side seams for ultimate protection. SECURE & SAFE: Presterilized for safe storage plus BPA and BPS free. Designed to lay flat for fast freezing and thawing to protect precious breastmilk vitamins and nutrients. SAVE TIME & PUMP DIRECTLY INTO BAG: Pump directly into Lansinoh breastmilk storage bags for convenience and reduced waste. Stand or lay flat for compact storage. Easy to use with write-on label and convenient pour spout. MOM FOUNDED & PARENT LED: Founded by a breastfeeding mom, Lansinoh has supported moms for 35 years with award winning breast pumps, nipple creams, nursing pads, and breast milk storage bags, helping families create bonds that last a lifetime. 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.