Hot answers tagged panniers
You might want to look into convertible backpack panniers. Mine is a little small by your standards but comes in a bigger version. It's cheap and not hard wearing so I wouldn't recommend it, but when I was looking there were proper bike luggage brands selling comparable bags with better mounting hardware.
There are some racks that mount directly onto the seat tube and utilise a quick release clamp; they only take a small load tho. This would avoid clamping onto the carbon. As others have hinted its not such a hot idea to do this as carbon is not designed for that kind of compression. You can find evidence of this with car racks where carbon frames are not ...
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