Kowalskis flight suit is patterned on the real Manned Maneuvering Unit (MMU) flown by NASA in 1984. But: The MMU was abandoned by NASA after the Challenger disaster because it was seen as too dangerous. The only flying suit in use today is a little emergency pack called SAFER, which carries just 3 pounds of nitrogen propellant. Contrary to what you see on screen, NASA would not allow untethered flight even with a flight suit. And certainly no self-respecting astronaut would go stunt-flying around delicate equipment, using up all his propellant, as Kowalski does. But hey, it looks really cool on screen.