I got a wild hair yesterday and made a trash bag for my car. It was super easy and quick, and it's reversible. I made it with things I already had, so no going out to buy anything new for it, either! For the inside, I cut to size a sheet of plastic cross stitch material, then stitched two of it's sides together with yarn. It helps hold the bag open, and holds a plastic bag inside for quick and easy disposal! I will likely go back and trim the strap on it though, it hangs lower than I'd like.