The XK-81 Jetpack is a gadget in Ratchet & Clank, invented by Dr. Nefarious on planet Gaspar and used by the blarg. It allows for long-term flight time when full of fuel, which is obtained from green fueling stations on various planets.
The XK-81 Jetpack is used by holding to fly upwards and consume fuel; releasing allows the player to descend slowly. It can only be used when a fueling station is available. Weapons can be used during the flight. The Jetpack has a fuel meter that indicates the percentage of fuel remaining. It flashes red when it is nearly empty and triggers a beeping alert when completely empty. It can be refueled by stepping on a fueling station.