Evenflo’s Advanced 5 fl. oz. Breast Milk Storage Bags are uniquely designed to help you collect, store and freeze your precious breast milk. Featuring an improved leak resistant design and their Safe Zip Zipper, you can feel confident that your breast milk is sealed securely for storing. These bags are made from a durable, high-density material and have wider side seals that provide enhanced strength. The special gusseted bottom design maintains a more stable, upright position when filling and the tear-off top creates a convenient pour spout when transferring milk from bag to bottle.