The Medela Breastmilk Collection & Storage bottle set makes it easy to keep extra breastmilk on hand. The convenient bottles allow you to pump, store, and feed all with the same container. Bottles' leak-proof, screw-on lids keep milk secure and fresh. Set includes 6 bottles Bottles are designed for easy collection, storage, freezing, feeding, and traveling Bottles feature easy-to-read volume marks Compatible with all Medela breastpumps for pumping directly into the bottle Dishwasher- and microwave-safe