But good for the pilot to carry the unit and not be forgotten in the glovebox when said aircraft crashes and burns
Our safety lecturers always emphasised if you're not wearing it you're unlikely to get out of the wreckage with it, in military we also wore a hefty hunting type knife, with saw blade type notching on the side opposite to sharpened blade, in order to smash the canopy or make other airframe modifications that may be necessary to enable exit.