A Clif bar, some beef jerkey, a few medical supplies for injuries you could sustain in the woods, a headlamp, extra batteries, extra socks, paracord, multitool, note pad, pen, sharpie, a flask to match your lighter, any number of things.
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I know I'm a gear whore. It's heavy, it's expensive, but it's worth it to look so \"Watch your language\" cool.