Regarding the ultralightweight trunk bag on rack thing, this Restrap race dry bag looks pretty close. Concerned could gather rainwater in the top, though.
Only 7l though. I'm thinking Alpkit Gourdon now.
Looks great. That in 10l with ultra lightweight shoulder straps that could be zipped away would be perfect.
I’ve put a 20l dry bag on top of a rack before and it’s just a tad too unstable for me off road. Might work for you.
Rec Alpkit Dual 13 or 20, you can easily attach to a rack and it's definitely waterproof.
@Merak started
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Regarding the ultralightweight trunk bag on rack thing, this Restrap race dry bag looks pretty close. Concerned could gather rainwater in the top, though.