Waxed Cloth Food Wrap (Made in a solar oven for bonus self-righteousness points)
...ambitious you could sew in an elastic band to hold the cover tight. How-To Making the cloths is very easy. All you have to do is cut some squares or circles of thin cotton fabric, like muslin. Pink the edges if you have pinking shears–this looks better, but I don’t think the edges will unravel much anyway, because of the wax. Size depends on intended use. I can imagine eventually having a range of sizes and shapes. For instance, I’m imagining that...