You could certainly open the rear airstairs door on a B727, and then exit with a parachute and a bag full of loot, as a Mr D Cooper proved in 1971; as well as that, I seemed to recall, the flight crew of a B727 being deliberately crashed for research purposes exited in the same way well before the aircraft was remotely flown into the ground. Wimps, of course, but quite sensible ones.
Unfortunately the rear airstairs door seems to have disappeared from more modern designs, so there's little point in taking your slim-line parachute with you as cabin baggage.