A twin-turbine pack off Mei Hatsume's workbench that grants its wearer a short stretch of flight. The Buster Hero known as Airjet supplied the idea, the U.A. Support Course student supplied the engineering, and Izuku Midoriya is the one shown strapped into the result.
Credit for the concept belongs to Airjet, the Buster Hero whose own gear pointed the way. Mei Hatsume, studying in the Support Course at U.A. High School, took the notion and built her own version of it.
The unit is a metal backpack carrying a pair of turbines. A red trigger, held in the hand, sets them off. Ignition comes hard enough to lift the wearer clear of the ground, though the flight it buys covers only a short distance.

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The twin turbines built into Izuku Midoriya's Jet Pack are what give it flight. Mei Hatsume built them after studying the gear used by the Buster Hero Airjet, and a hand held red trigger ignites them to lift the wearer off the ground.
Mei Hatsume, a U.A. High School Support Course student, built the Jet Pack for Izuku Midoriya after studying the gear of the Buster Hero Airjet.
Mei Hatsume based the Jet Pack on gear used by Airjet, a Buster Hero whose own equipment pointed the way toward her design.
The Jet Pack is a metal backpack holding twin turbines that ignite when the wearer pulls a red trigger held in hand, lifting them clear of the ground.
The Jet Pack only grants a short stretch of flight; ignition lifts Izuku Midoriya off the ground, but the distance it covers is limited.
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