When did they stop putting handles on mattresses?

I seem to recall that during my college years, when moving was a frequent occurrence, most mattresses had two handles sewn into each side; not the box spring (or box I guess it is now), just the mattress.
I am in the process of a move and this question came to the forefront while moving the bedroom furniture. As you can probably tell from the question, it has been a while since I moved.