You Tube
As stated earlier someone posted a study but I cannot find it. That same study is on youtube. I recently purchased a BRUTE, it is better than old time coolers, but not as good as K2 or Yeti. However, the Brute weighs a lot less than the others, so it works for my applications. Also note that sometime back, YETI was bought buy a foreign group, and the lifetime waraanty is now a "limited lifetime warranty for 5 years". There is a really good thread on tht about the issue you raised and directs you toward many different but independant studies.
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