Jet-packs are no longer in the realm of sci-fi, thanks to the JetLev Flyer. But this pack has a key difference: it uses water for propulsion, fed by twin hoses hooked up to a separate vessel tethered behind the user. With top speeds as high as 30 mph and a blast of power than can shoot you 50 feet in the air, it looks like a lot of fun. But with a pricetag hovering (ahem) around $230,000, it certainly ought to.
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