This is my favorite project at the moment because there is really not much to it, except some up-cycled plastic bags and an old belt. But the effect is incredible. You just melt multiple layers of plastic bags by ironing together. Don't forget to use some separating Layer, baking paper or even a towel will do, otherwise you'll have the hole shebang glued to the underside of your iron.
I made a couple of small pouches too, without sewing this time, I just melted the seams together, works a treat.