If you want a timbuk2 bag I will sell you mine for $40, plus you pay shipping. I live in chicago so you can meet me if you live by me.

Custom 2010. The left panel is navy blue, and the other 2 panels are black. Blue interior. Has compression straps, and a black pad. In brand new condition.

I think I paid $140.

I agree, I think all bags you will sweat some in. But some more than others.

If I were you and want a messenger I would invest in a pac, if a little cheaper go bailey works. If you are looking for a backpack then get a mission workshop. You figure that this is something that you will use every single day. Rain or shine. For several years. The quality and comfort will mean a lot. The difference between spending $60 or $200 is nothing.