Also on these boards
Brown Paper Bag DIY Journal by Judy Wise: More Stuff ... I may have to stop using my own cloth grocery bags for a little while...
Cover your surface with aluminum foil then sandwich three plastic Target bags between two sheets of parchment paper. Put your iron on the hottest setting. Keep your iron moving around for about 15 seconds then lift up the parchment to see what you find. It could be melted to bits with tiny, lace-like holes; it could be thick and solid—results vary widely depending on the grade of plastic bag.