Just slow, it appears that this is made for a commuting type ortlieb pannier, how would it attach to a typical ortlieb?
I don't have one yet, but it appears that they provide hardware for mounting directly to a pannier on the front or back. The mounting hardware also accepts their water bottle cage and their non-mesh pocket which makes for a nice versatile system of choices.
The mesh pocket is something like 12"h x 11"w x 8" deep. Big enough for a helmet but it folds up when not needed.
Thanks for the reply.