A gadget called the Jetlev can lift a person 30 feet high by pumping water from a backpack through a hose connected to a small, unmanned boat.

一个叫“水箭背包”的小玩意可能通过从双肩背包里抽水将人举到30英尺高，双肩背包通过一条软管连着一艘无人操控的小船。

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Jetlev Southwest, headquartered in Newport Beach, California, frequently caters to executive groups -- particularly from the tech industry -- seeking a novel team-building experience.

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One of the most surprising qualities of the Jetlev is its relative quiet, a tranquil plashing no louder than, say, the fountains at the Bellagio.

WSJ: Jetlev R200 Jetpack: Personal Flight, Beyond Bond

The Jetlev design is still in its early days, says Mr. Katz, and a friendlier, more forgiving control mechanism is certainly on the drawing boards for Jetlev 2.0.

WSJ: Jetlev R200 Jetpack: Personal Flight, Beyond Bond