Lansinoh Breastmilk Storage Bags - 25 Pre-Sterilized Bags Lansinoh Breastmilk Storage Bags were specifically designed for convenient and safe storage and freezing of breastmilk. Patented double zipper seal for no leaks or spills Strongest bag available Outer write-on tab prevents ink contamination Convenient pour spout and self standing bag for ease of use Tissue pack dispenser for easy access and storage BPA free Pre-sterilized medical grade milk storage bags #1 selling breastmilk storage bag Frequently Asked Questions Are Lansinoh Breastmilk Storage Bags BPA-Free? Yes, Lansinoh Breastmilk Storage Bags are 100% virgin plastic and contain no plastizers. Specifically, they are made of FDA approved Food Grade LDPE (low density polyethylene) and LLDPE (linear low density polyethylene), that is 3 Mil Thick. This type of plastic is BPA-free. What type of plastic are Lansinoh bags made of and are they recyclable? Lansinoh Breastmilk Storage Bags are 100% virgin plastic and contain no plastizers. Specifically, they are made of FDA approved Food Grade LDPE (low density polyethylene) and LLDPE (linear low density polyethylene), that is 3 Mil Thick. Lansinoh Breastmilk Storage Bags are recyclable. They fall under the #4 recyclable category which includes bags, merchandise bags, pharmaceutical, packaging etc. Can I microwave my milk while it is in Lansinoh bags? No, microwaving is never recommended for breastmilk as it destroys valuable nutrients and vitamins in the breastmilk. Additionally, it can create dangerous hot spots that can burn the baby when you are feeding the milk to him or her. Are Lansinoh bags reusable? Lansinoh Breastmilk Storage Bags are designed for one-time use only. Can I pump directly into Lansinoh Breastmilk Storage Bags? Because Lansinoh Breastmilk Storage Bags have a double zipper closure, they do not fit directly onto a pump flange but you could use them if you are willing to hold the bag onto the pump with your hand.