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!
What alternative uses do you have for your nalgene bottle? Please share!