[Paddlewise] Plastic garbage bags

Has anyone ever used a plastic garbage bag as an emergency floatation device? 
It's already folded, all you have to do is wave it arould until it fills up 
enough, squeeze the opening, keep it in front of you and dog paddle to the 
shore. I tried it on a lake and it worked fine. It's no substitute for a vest 
but it can come in handy.
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