• I've sweated more (okay, "perspired"....for those of us that are posher than the rest) with a backpack than a messenger bag. I found that because my Timbuk2 moved slightly across my back as I ride, it allows cooling to small sections of my back as the sweat evaporated. Also, because of the shape of the bag, I felt that less of the bag actually rested directly on my back - therefore less trapped heat.
    Just my personal experiences.

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