I didn’t realize it’s 2051 already:

Festo AirJelly

Quoting Engadget: Suffice it to say Festo’s AirJelly is powered by some magical jelly fish properties, a lithium-ion battery, an electric motor and a bit of helium. If that’s not floaty enough for you, there’s also a water version, Aqua Jelly

Festo Air Ray

via Geekologie