I had seen these in an aviation magazine, the aircraft version of this is almost 500 dollars,but the comsumer version is much cheaper, not even 50, same thing, these are really supposed to work, if you only go on long trips once in a while these would work great,i may try one myself.
http://www.kooleraire.com/FAQ.htm
the pilots who have the aviation version swear by them. there used to be a version of these that attached on the side of your car window in the 30's, but it was cooled by passing ait, but they worked and have been around that long.
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