I have heard of so many of these bags starting fires since the craze. My mind keeps wondering, who in their right mind, would put any kind of cloth in a microwave for 8-10 min. And especially anything with polyester, i.e., cotton covered polyester thread. With all the junk made in China now, wouldn't trust any fabric or batting to be 100% anything. A friend of mine works for an after fire clean up company, and we were discussing this a month or so ago. She said, oh well, things like this keep me employed. Got two of the potato bags for Christmas a few years back, they went straight in the wastebasket.
My potatoes I m/w on the tray and my corn, in a m/w vegetable cooker, with a small bit of water in the bottom. Please keep the cloth out of your m/w ovens.