I stash them in a box in the closet. Saves some room, keeps them from collecting dust, etc.
Plus, I don't really have room in my room for a bookcase since it wasn't originally mine. We used to sleep here all 3 siblings when we were younger, and then slowly my older brothers "moved out" of the room, leaving me with a huge closed half of it isn't used by me and that doesn't let me do too much with it because it's a corner closet
so it's half a wall here, half a wall there, and nothing to do with it.