Originally Posted by Athens-m50
anyone used the "Hot Water Bottle" way?......Boil water and fill your Nalgene bottle....throw it in the bottom of your bag?.....seems like that might work?.....not tried it?
I came here to say this. Hot Water Bottle will work wonders. I also use a small piece of a blue foam pad that I've glued on a piece of reflective emergency blanket. I can attach this with some shock cord to the foot box of my LeighLo TQ and feet stay toasty all night.