Here’s one from my significant other’s mountaineering class. I froze my ass off camping in in Bryce Canyon so you don’t have to.
While camping, you can fill a large nalgene (or other water) bottle with hot water before bed, and put it in your sleeping bag for extra warmth all night! If you find the surface a little burn-y to your skin, you can wrap a bandana around the bottle.

Bonus warmth points if you drink all the water once you wake up. Staying hydrated, friends!
Also see: Pro-Tip Tuesday: Alt Uses for Your Water Bottle While on the Road 1
What alternative uses do you have for your nalgene bottle? Please share!

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