>Not all are worth carrying though. I have seen some that just flop on top
>of the water where no rescuer would notice them in high seas .. some are so
>short they are not worth inflating .. others don't stay inflated & upright
>unless you really make the effort to hold the open end down tightly under
>the water ie right down near your waistline.


Have you seen the sausages made by AP Valves (Buddy) in the UK.  They are
tall enough to be seen and have a "trunk" in the bottom end that allows easy
filling while preventing them deflating at the surface.

Cosma

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