/ic/ - Artwork/Critique

How do you store your oil and acrylic paintings without having them stick together after a few days, get dusty and use up a lot of room ? Is there a special type of paper that you can put between the canvases / boards? or should I invest in a sort of crate to store them? The problem is, I mostly paint on paper or carton, so they can't really stand on their own... what to do...