My nephew is attending grad school in Montreal, Canada (yes, tons of snow and cold in winter). He rides his bike to school year round and wanted a big messenger bag that was comfortable. Being a doting aunt and a huge Tom Bihn fan, I bought him a superego with a q-am strap. I also took my absolute strap in case he preferred that. He was thrilled! He wants to be able to carry a couple of grocery bags - no prob! He has a teaching assistantship and sometimes has tons of marking - no prob! we loaded it with a dozen books to check comfort of the strap when fully loaded - no prob! he decided that the q-am strap was comfy so he kept that. When last seen, he was using the bag as his suitcase on his way back to Montreal.
Thanks, Tom Bihn for designing such flexible, comfy, well designed bags. i think I may have converted my whole family as they were looking at my copilot with envy.