From now on you can express and store breast milk save and efficiently with the Avent breast milk stock cups. The cups can be used more then once. The only thing you have to do is sterilize the cups. You can easily do this with the Philips Avent pump or teats- one system. Furthermore the cups are easy to use. They are dishwasher proof and featured with a leak proof lid which makes them perfect for transport. The cups can be stored both in the refrigerator and freezer. Please note that lids are included.