The storage system Philips Avent is just great! We have just bought our first little one, in order to freeze expressed milk can. It is now also used for: - The transportation of tea - The transportation of porridge - As a drinking cup for the move (stays clean thanks to the lid and the drops are not followed in the case) - As a container for a damp cloth (wipe the mouth go; the cloth then also remains moist and the dry bag) - Everything else is 100% should be taken waterproof. In addition, the cup and the lid can be cleaned super and extremely space-saving stacking (with or without a lid). Buy recommendation!