Great question — answering as the UphillTech team:
The absolute best is going to be titanium, but it also happens to be the most expensive. I'm not sure where you heard that it shatters in the cold, but being a space age metal I would think it can handle cold Earth's temperatures just fine. If you can't shell out the cash for titanium it's more or less a toss up between aluminum and stainless steel. Technically aluminum leaches, but so slowly that for just your backpacking gear it's not a problem. Stainless steel doesn't leach but also doesn't distribute heat as well, so you need to be sure to stir your food more, but that's not a big downside in my book. I use stainless steel myself. One other recommendation I need to make is, no matter...
Full answer by Justin C: https://outdoors.stackexchange.com/a/1170 (CC BY-SA 3.0).
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