I have a MTX trunk bag and its great with my Topeak racks. However I have some bikes that can't fit the Topeak rack.
Is there a mod I can do to allow the MTX bag to slide on for non-Topeak racks? I'm thinking maybe attaching an aluminium extrusion, or folded sheet metal. Perhaps route a groove in some High Density Polyethylene and fixing that somehow.
Or maybe cut off the top of a cheapish Topeak rack and rivet than on. Any ideas?