- This Nuby kit includes two RapidCool bottles with digital lids, so you're covered when one's in the wash- It cools formula from boiling to baby-ready in five minutes or less, so you're never left waiting- With an insulated flask and two milk powder dispensers, feeding on the go is quick and easy - The smart LED lid changes colour from red to orange to green, so you know exactly when it's good to go- It's made to meet NHS guidelines, giving you full confidence every time you prep a feed