Microwave Steam Sterilizer Bag eliminates 99.9% of common bacteria and germs. Microwave Steam Sterilizer Bag thoroughly disinfects most breast pump accessories, bottles, nipples, pacifiers and cups and is ideal for storing pump parts between pumping sessions. ME8407 Microwave Steam Sterilization Bag sits upright in the microwave. Microwave Steam Sterilizer Bag can be used by simply placing the nursing products inside the bag and filling it with water, and put them into the microwave to disinfect. Microwave Steam Bag is reusable, durable, and chemical free.