How much helium does it take to lift a person? About 70,000 liters. But you, too, can float around with a helium balloon in a safe manner, thanks to a French company called Aéroplume. Their balloons are set up in an old blimp hangar so there's no chance of flying off into the wild blue yonder. The helium balloons make you relatively weightless, you get to experience flying without a plane. How cool is that?