I carry (legally) a Ruger LCP, sometimes, when I backpack. I don't plan on ever using it, but there are some places where I have run into some rowdy partiers. This is especially true on trails that are accessible by horse. Horses allow people to pack in beer and I have seen some wild campers. If I'm hiking past 10 drunk guys while hiking with my wife, my LCP provides some comfort. It weighs 9.4oz.
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When you truly understand nature, there is no such thing as a bad day.