It's just a vest. It takes up no room in a flight bag, takes 2 seconds to put on, and as an added bonus is "Hi-Vis".
Now let's get onto a real safety issue in aviation. Something that has been carelessly & dare I say willfully used with reckless indifference against & by fellow aviators for years; The Semicolon.
This punctuation is real people; and used in the wong hands, who knows what untold damage may be done.
Are you or someone you know a victim of semicolon use?
Be safe people.