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> Ideally yes but it's really hard to find fully metal driking bottles.

Klean Kanteen?

Using an insulated bottle kind of defeats the purpose which is to transfer heat from the water to yourself. You'll wake up in the morning with a bottle full of hot water but you'll still be cold.

Kleen Kanteen sells non-insulated metal bottles as well; I've used them for this purpose (not sleeping, but holding against my body to help stay warm in a cool room). Bonus: once the temperature drops far enough you can also drink it for a quick internal thermal boost, if needed.

Just looked them up. Looks really nice.

Maybe a bit heavy for me when hiking but really nice for day to day stuff.

I like the Vargo stuff. Also the new Keego flexible bottles look really interesting.

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