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A nice big thermos is a lifesaver on cold days. Remember that every thousand feet of vertical gain results in a roughly five degree loss of temperature. A 30f trailhead can mean undrinkable water by the time you start down from the summit. Fill that bad boy full of hot creamy sweetened black tea. It can also make a tremendous difference sharing some with an unprepared and cold stranger on the mountain. Found some poor guy above treeline in a wind storm one day. Lent him my oh shit mittens, led him back to cover, and gave him some hot tea. Set him right. Nothing warms you quicker. All that cream and sugar kick-starts thermogenesis. Worth every ounce of extra weight.
