At some point in your life, you end up with a set of sheets that are just too ragged to throw on a bed — even your own bed. You can always cut them into rags, but that would make for A LOT of rags. I keep an old top sheet in the back of my car. It works perfect for throwing down a picnic blanket, lawn blanket for concerts, a towel for impromptu visits to a lake or creek or getting drenched in the rain, and it works well to lay in the back of the trunk to contain messes from groceries or visits to the hardware store. When it gets dirty, I wash it and return it directly to the back of my car.