Evenflo Feeding's Advanced 5 fl. oz. Breast Milk Storage Bags are perfect for collecting, storing and freezing your precious breast milk. Their eco-friendly bags have 30% less material, reducing waste. They are made from a durable, high-density military grade material for extra strength, but are thinner for quicker freeze and thaw times. The special design and wider side seams allow for a stable, self-standing position when filling. The SafeZip™ dual track zipper helps to ensure milk is sealed securely for storing. The perforated, pull-off top creates a convenient pour spout when transferring milk from bag to bottle. The bags can also be used with the Evenflo Advanced Breast Milk Storage Bag Adapters that easily attach to most standard neck breast pumps for added convenience. What's in the box?