Jetpack

A Jetpack is a worn device (Generally attached to the Back) that uses some form of accelerated gas to grant said person flight.

Real life jetpacks

In Star Wars, Jango Fett and latter on, his son make use of Jetpacks
In Warhammer 40,000, Jetpacks are fairly common, from those that are used by Imperial Space Marines and by Elite Firewarriors in Tau Battlesuits to orkish "rokkit packz" (solid state Rockets with a series of straps to hold the Ork on with a system of controls consisting of an on/off switch) used by "Stormboyz".