Scott P wrote:Has anyone constructed their own Nalgene insulator sleeve? It seems like throwing it in a sock with a hand warmer would work for most situations but surely someone has gotten a little craftier than that.
It may work on some days, but I'd guess it wouldn't work at all on a cold day (and some days are in the -30's in the mountains). I've had Nalgenes freeze while wrapped in a seperate down coat while also tucked inside the down coat I was wearing. An insulated thermos is the way to go on those cold days.
Here is a little experiement at around 0F.
Maybe we need movement to keep the water from freezing!
If we asked the question at the physics forums; would we understand the answer?