I am really making good use of this steriliser. the fact that it's air tight is very useful because i can put it on the bottom of my pram and take it with me. I have a teat and bottle ready in my cooler and the sterilised teat and bottle in the water, which then after the feed outside i swap. I go to the toilet, wash the teat and bottle I used and put it in the steriliser and take the sterilised teat and bottle out. Works wonders and it saved me coming back home too early many times, as cafes are more than happy to give you some boiling water to warm up milk, but they don't like to put bags in their microwave, for health and safety issues they claim. So while it's OK for me to warm up milk, I couldn't just bring with me a sterilising bag and ask the place to microwave it for me for 3 minutes because they wouldn't do it. With the steriliser i only need their bathroom and I can have a fresh bottle for my son!