Admittedly your back will get sweaty with the Kriega (assuming the stankin' hot SW and you riding without leathers), for it's purpose it's the best I've come across..no wait..there was that 'Nike Epic hardshell' backpack I had a decade ago that for the life of me they stopped making..it was "perfection"...couldnt understand why they moved on from that. Anyhoo..hows about another spendy over-designed backpack...http://www.ergon-bike.com/us/en/product/bc3