Not inexpensive, but far and away the best you can get for this
purpose is called something like the SOSpender. As its name suggests,
it's no bigger than a very wide suspender strap.

You don't want a vest that automatically inflates. Safest would be a
combination of pull-this-string to use a CO2 bottle, combined with a
little hose to blow into for a backup.


-- all the best, Dan Ford

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