We think if you're going to use under the bed storage, boxes that are specifically assigned for certain items are crucial to keep things in control. The built in cubes under the bed pictured are great because they provide built-in order to the area.
What about you? Do you store things under the bed? Personally, I've never liked the idea of sleeping over "stuff" so I prefer an empty floor under our beds, but I won't deny it's a useful space to have when space is in demand.
(Image: by Matthew Williams for House to Home)