Optimal P.p Wide Neck Food & Milk Storage Cups is a space saving storage system designed to grow with your baby. It allows you to use the same cup to express, store and feed breast milk to your baby, as well as store baby food. Storage cup have twist-on, leak-proof lids for safe storage in the fridge, freezer or on the road. There's no risk of leaking or puncturing. Easy storage and cleaning, perfect for on the go, or for storing in the fridge or freezer. Easy to organize with label cups that help you keep track of dates and contents.