I made my daughter a tater bag out of 100% cotton, used cotton batting, and cotton thread. She put the potatoes in and went to check on her daughter and when she came back her new microwave was on fire. My other daughter had no trouble with hers. So you need to tell everyone to watch things that they put in. I think the timing and the heat of the microwave is very important. I do love the fabrics you are using and hope it works out. :-D