Features:The Medela Breast Milk Storage Bags have been hygienically pre-sealed with durable material and double-zipper protection to prevent leaking. These bags safely store breastmilk in the freezer, fridge, or when traveling.These ready-to-use breastmilk storage bags are constructed from durable double-layer material and a built-in double zipper seal to keep your breastmilk safely stored in the fridge or freezer.Madela breastmilk storage bags are self-standing and come with a large write-on area, so you can document the date and other vital information for safer storage and use.The Medela Breast Milk large 6-ounce Storage Bags have been designed to lay flat for space-saving storage. This unique feature also allows quick thawing of frozen milk. The bags are made from food-grade, BPA free materialTo help you keep these breastmilk storage bags clean and organized, we’ve added a bonus resealable transport pouch