There are also automatic-activated inflatable PFDs that inflate when they are immersed in water. They operate on a small tablet that dissolves in the water and causes the inflator to activate and fill the inflatable cell. These automatic ones also have a back up pull tab inflator just in case if doesn't deploy automatically. I've only used the inflatable ones on my float tube because I think its much safer to wear a regular one on a kayak IMO.
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