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Never had a problem whilst carrying on my back, then I get a front rack (front axle to handlebars type), attach it to bike with 25c tires, and withing two months elements I had to repair my f2.8 70-200mm & f2.8 17-35mm, two heavy lenses with lots of elements. You can imagine how expensive that was. Too many bumps and vibrations from the road. Start carrying on my back again, no problem. If you are carrying kit on a rack I'd be careful.
Cheers man. It was the answer to the question: How can I keep riding to jobs, but not carry my kit on my back as a) kit os getting bigger and heavier, b) my poor back, and c) wanting to turn up looking presentable and not with a sweaty back.
It works a treat. A few years ago I had a normal front rack attached to handlbars/forks, but the vibrations from the road bumped the kit around it shook the elements loose on some of my lenses and that was not cheap to repair! Proper happy with it.