This versatile 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. And as your baby grows the cups are ideal for storing and transportation home-made meals and snacks. Attach cup and adaptor to any breast pump. Sturdy, stackable and leak-proof cup is easy to label for the fridge or freezer. Leak proof, twist-on lid for safe storage in the fridge or freezer. The outer tread twist-on lid ensures a secure seal and no leakage. Pre-sterilized cups are ready to use. Protect breast milk by expressing, storing and feeding from the same container. No need to transfer breast milk. Use the same cup to feed by attaching the pre-sterilized cups are ready to use. Stackable cups and lids for easy storage.