Originally Posted by
Henry Macwhirr
I am of the persuasion that wears the bag low on the back and carabiners it to my belt so that it won't migrate.
You should re-think this. Having a messenger bag that sits high and wraps around your back is much more comfortable and stable on a bike than a "messenger style" bag that basically hangs off your shoulder. This is one of the reasons I bought my Chrome Citizen. My leather messenger bag was fine for walking around, but on the bike it sucked. Having a real messenger bag is worlds better.