Originally Posted by Doris Sumnicht
On making potato microwave bag: Use ONLY cotton materials and thread throughout the project. We learned of some fires from using these bags (while I was working for a fabric outlet) and the answer seemed to be is not to use any chemically based materials (polyester, acrylic) in the construction. I wish I knew whether Insulbright is safe to use. These bags are longer than wide, about 10 x 15, fully lined, with batting inside. I quilted mine around the design of the outside print, then finished the bag with a turndown of the top. Flannel is good, at least for the lining.
Also, a good idea to clean when something spilled on, I've heard of this too when they got something spilled on them and it gets heated again it may cause the bag to burn. Do not use any metallic materials either.