I've read a couple of articles about those in the past, I think every person that goes into the wilderness should carry a couple of them, you never know when you might need one if you're near a body of water. I think it would also be a good prepper item.
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For sure! Any item that enables the individual to become more self reliant, that isn't dependent on electricity is a valuable resource.
Thank you for your comment.......................billytwohearts