Panniers? Cool.
If you install them, you may need to soak them first in a solution that sets the color and prevents UV fading. The canvas that I currently have on my seat was initially the same color as the paint. The sun faded it. It faded very quickly like in a matter of 3-4 days in the sun.
I then dyed it brown and it faded again. I've read about the the solution to set the color/prevent fading but haven't tried it yet myself. In the next week or two I will probably re-dye the seat cover and do the soak to prevent fading. I'll let you know how it goes.
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