Ok. I wasn't going to say anything but what the heck. You see, stainless steel is very conductive so it feels as warm as what ever you put in to it. So.....in addition to the other uses I mentioned before, two more uses for the Klean Kanteen: night time urinal for frequent male urinators and sleeping bag heater.
This multi-use discovery was by pure accident early this summer when I realized I had forgotten my plastic Gatorade bottle urinal. When one urinates as often as I do, and has trouble falling back to sleep after hanging it loose in frigid temps, forgetting the urinal is reason to panic. What to do!?! I kept looking at my Klean Kanteen that eve and thought to myself "it's better than not getting much sleep and what the heck...it was MY urine and not someone elses". That night, after doing the deed, I was reaching outside my shelter to dump the bottle when I couldn't help but notice all the heat coming off that shiny Klean Kanteen. So.....I aborted the dump, screwed the lid on tight, and put it right back in the bag.
A thorough rinsing in the morning, along with some crushed Horse Mint growing at camp, in case there was any residual flavor hanging around, and I had my water bottle back. I like my Klean Kanteen.