Jet Pack

Both posts are correct. These are usually fueled on concentrated hydrogen-peroxide and don't typically last over a minute. You can build one at home, but as you can imagine, not only is it dangerous and hard to control, but the peroxide alone is highly hazardous, hard to get ahold of, and expensive in concentrated form.

Yeah, I saw a program on sky and they only fly for around 45 seconds then need to refuel.

27 second flight....he wouldn't have had much fuel left