Design Green Design Just What We Needed Dept: An "Air Conditioned Backpack" By Lloyd Alter Design Editor University of Toronto Lloyd Alter is Design Editor for Treehugger and teaches Sustainable Design at Ryerson University in Toronto. our editorial process Facebook Facebook Twitter Twitter Lloyd Alter Updated October 11, 2018 ©. Kucho Air-Conditioned Backpack Cooling Pack Share Twitter Pinterest Email Design Tiny Homes Architecture Interior Design Green Design Urban Design It is getting hot this week in the east of North America, going up to to the high eighties (°F, 303°K, 30°C) in New York. Backpacks can make you feel even hotter, as they insulate your back and prevent evaporation of sweat, so you end up wet and sticky. So call up the Japan Trend Shop and order your Kucho Air-Conditioned Backpack Cooling Pack. © Kucho Air-Conditioned Backpack Cooling Pack It is not actually a backpack; it is strapped onto your pack and sits between your pack and your back. And it's not really air conditioning; a fan powered by four AA batteries pushes air through vents in the cooling pack, which increases evaporation of sweat, which cools your back. Every four hours (at high setting) you need another four batteries. Kucho Air-Conditioned Backpack Cooling Pack/Promo image The Thermographic photo shows that it is quite effective, although they do not tell us the relative humidity when the photos were taken. On a very humid day one will feel far less evaporation and cooling. Lloyd Alter/ Deuter backpack /CC BY 2.0 But I find it fascinating that they think one needs to throw batteries at a problem to solve it. I have a few German Deuter backpacks that I bought when a sporting goods chain went bankrupt a few years ago (they are expensive) ; they all have what they call an aircomfort cooling system where an open mesh sits against by back and the pack itself is a few inches away. It is very effective and comfortable; I have always wondered why every company didn't do this. Perhaps it is because the metal stays that curve the back of the pack away from my body take up space and add weight. But it still proves that there are alternatives to batteries.