Yes, in fact, REI used to sell an industrial-strength bubble wrap pad that was tough enough to sleep on. Only problem was I froze--it provides no effective insulation whatever. Paired with an ensolite pad (the closed cell foam of the day) it definitely made a more comfortable bed than foam alone.

Has anyone tried using a roll of bubblewrap instead of a foam pad? I know that bubbles will lose air after a while, but I'd think they'd be good enough for a few trips.