I stumbled across this link the other day which seems rather ingenious and was wondering if anyone has tried such a contraption whilst hiking? If not, do you think it would be effective? I'm tempted to try to make one and then see how it performs in various temperatures.
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The one problem I see is that it actually doesn't keep things cold enough. The listed rate is 6C (42F). For refridgeration you want no more than 4.4C (40F) and ideally want closer to 1C (34F).
6C makes it little more than a growth chamber for many bacterium: http://www.gov.ns.ca/agri/foodsafety/pdfs/dangzone.pdf
Good point..I have taken a safety and sanitation class as well, however the bacteria will produce at higher rates at higher temperature levels in this zone, so it does help. Tons of people in Africa use this cooler every day.