This handy set of 4 Tommee Tippee Closer to Nature Milk Storage Pots 2oz/60ml mini pots with graduations on the sides comes with sealing lids. These is designed to collect and protect your breast milk. The milk storage pots are stackable, dishwasher proof, microwaveable and suitable for freezing. The pot sits in the neck of the closer to nature bottle while expressing breast milk via either the Manual Breast Pump or our New Electric Breast Pump.