Philips Avent Envelopes Sterilization Steam In Microwave The reusable bags for steam sterilization in the microwave can be used to sterilize bottles, breast pump and other products in just 90 seconds * Each bag includes a checkbox. By selecting the check box, you can track quickly and simply in the number of reuses of each bag. Each bag comes with a handle to handle it safely. It is marked an area that allows you to remove the bag from the microwave safely. Each pack of bags for sterilization in the microwave steam includes five bags and each bag can be used up to 20 times. This means that you can sterilize bottles, breast pump and other accessories up to 100 times in a single package. Format Box with 5 bags.