I have been making these for several years to sell at our local hospital Gift Shop...to date I have made nearly 1200 and have had problems with only about 3 of them (can't diagnose the reason)...The real key to success with them is to use 100% cotton fabrics and polyfill that is labeled "fire retardent"....they are marvelous...corn on the cob becomes especially sweet when steamed in these bags...I use dry paper towels....