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The Chrome bags have the main strap that goes over your left shoulder, and under that there's a little stabilizer strap that comes up under your left armpit to hold the bag in place. If you've got...

I have a Chrome Mini-Metro messenger bag that I use when out on my road or mountan bike, where I don't have my cargo rack mounted. They're a little pricey, but I find it's a lot more useful and...