There are some around aside from adaptations of non specific products.
This is an adaptation of a non specific bag
But as you correctly observed any bag connected to the frame will expose the camera to a lot of vibration, depending on the type of terrain that you will be biking on.
So if tarmac is your thing you won’t be exposing the cameras and lenses to too much stress un less you fall of you collide with some hard object.
However I think that the best thing for you is to carry a backpack if you have a lot of gear or alternatively stick to carry one body and one lens worn with a harness on your chest, which might include, or not, a backpack with some more gear and other necessities
Edited by milandro, 05 May 2016 - 07:57 AM.
the popular expression wishful thinking is an oxymoron!
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