When snow is falling and a cold wind blowing, skiers crave hot drinks, not cold water. An ordinary canteen serves as an excellent thermos bottle if filled with hot coffee, tea, or other drink at breakfast, heated in the canteen until it actually boils and then stuffed quickly into the center of a rolled sleeping bag. The bag should, of course, be placed near the top of the rucksack so that the canteen can be readily reached.
On cold days the possibility of preparing hot drinks during short rests should not be overlooked. The ski stove will heat a quart of water to the boiling point in less than ten minutes. Tea and sugar should be kept in a handy part of the rucksack in anticipation of such stops.