This time of year you'll be wanting to keep your insulin warm. Like close to your body heat. If it freezes you'll be in trouble. I've never done anything to keep my insulin cool while hiking, I don't even refrigerate it at home. It does not go bad, that is like a myth. If you are storing extra insulin long term keep it in the fridge, but your current vial will be fine at room temp. Pretty much the only time heat has ever damaged my insulin is when I leave it in the car for a long time on a hot summer day. You can tell by looking at it. The texture of the insulin changes, if it's the cloudy white insulin you're using the white particles get "clumpy".Originally Posted by neo