Originally Posted By wandering_daisy
You need to start the test with the temperature water you typically use backacking. It is amazing how much difference it makes. To save fuel I fill and solar heat a 2L platypus as soon as I get into camp. A few hours of sunshine will really heat it up, especially if you put a black stuff sack behind it. Heating breakfast water, cold from the night, takes almost twice as long. I have never had enough nerve to take the platypus inside my sleeping bag to keep the water warm for AM coffee.


We do the same thing, but put the Platypus bottle inside a black nylon stuff bag. In direct sunlight, it's amazing how hot the water can get---and how much fuel you save.
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