[LIST][*]About the product[LIST][*]HYGIENICALLY PRE-SEALED: 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.[*]DURABLE DOUBLE-LAYER MATERIAL: These ready to use breastmilk storage bags are constructed from a durable double-layer material and built-in double zipper seal to keep your breastmilk safely stored in the fridge or freezer.