Your Philips Avent Premium 2-in-1 Warmer & Sterilizer or Premium Fast Bottle Warmer is compatible with all Philips Avent bottles, storage cups, and milk bags, as well as most commercially available baby bottles and jars that fit in the appliance.
The appliance can be used for bottles and containers with a maximum diameter of 76 mm (3 inches) for both warming and sterilizing. The sterilization attachment supports bottles and containers with a maximum height of 173 mm (6.8 inches).
Note: When using milk bags, check their instructions to make sure they are safe for warming.