I won't use the bag in my mw...too many horror stories. When I mw baked potatoes, I just wash them and prick them and stick them in the mw. When I take them out, I give them a squeeze and then I used to wrap them in a clean dishtowel to finish cooking (I was always taught standing time after microwaving was important). Nowadays, I use my cute little potato bag for the 'standing' time instead of a dish towel.