Part of the Pump & Go system, to ensure every drop of breast milk is protectedPre-sterilized Pump & Go milk storage bags-use just one to pump, store, warm and feed!Storage Pouch clicks securely into place with Breast Milk Pouch Bottle, so no need to transfer breast milk for feedingBreast Milk Pouch Bottle comes with our award-winning Closer to Nature Nipple, for a smooth transition from breast to bottleFits pumps from all major brands using Pump and Go Breast Pump Adapter SetCompact, recyclable, and as always, BPA-free