After reading some of the comments in this thread, I think a waiting for folder sounds like a good idea.
However, in the course of not having one, I have labelled a lot of folders for single sheets of paper. The value of doing that has frequently surprised me. As soon as I have a second piece of paper there is somewhere it belongs. Having somewhere for it to belong is important because it reduces my resistance to writing notes to self or reducing scribbled diagrams.