Do you have one zillion plastic drugstore and grocery bags under your sink, or perhaps smushed into a drawer? Ever wanted a cheap and easy use for them? One that leaves you with an intriguing and useful homemade craft supply? Do you have an iron? Why don't you fuse them together?
Plastic bags (thin, flimsy ones work best)
Parchment paper, freezer paper or plain old copier paper
Iron (and your favorite ironing surface)
Flatten out the bag and trim the bottom seam and handles off. This allows the bag to be opened up into a larger rectangle of plastic.
We find that between 6-8 layers of plastic gives the best results. So, you can either fold your bag twice until it is 8 ply thick, or use three or more bags layered on top of one another. Trying to fuse less than 6 layers often results in little holes forming in the finished piece and a generally weaker material.
Sandwich your plastic bags between the parchment paper
Peel the parchment paper away from the finished plastic sheet. Voila. Now, you can use this stuff to make a million things. We've made re-usable grocery totes, wallets, and floor cushions; I think its an inexpensive way to make waterproof linings for beach bags and makeup clutches.