There have also been a number of "strap on" helicopters from the Easter Block in the 70's
Engineering this is really quite tough. Most of the "jet packs" were in fact rockets (because jets actually have pretty poor T/W ratio unless they're attached to wings). The constantly falling mass meant take off was easy, but hovering and landing insanely tricky. Like the lunar landing simulator, but without the on board computer.
So how fast do you want to go? As you're carrying the fuel can it needs to be fuel efficient as well. My instinct is contra rotating rotor blades could be adequately quiet, relatively easy to steer and reasonably fast but sadly lacks the "coolness" factor of the turbojet whine of a supersonic airflow at your back.
Biting the hand that feeds IT
