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The Mack Workshop rack bags don't have any 'internal structure' like a rando bag does, it's just the material giving it form - like a backpack. No easy way to put any plastic board or whatever in it to give any rigidity as the floating liner is stitched in at the top.
I couldn't get it to work with my SJS small canti-rack, but that's my fault as it's really designed for a rack that's full width/a basket.
What are the bag options for use with a smaller rack e.g. Nitto M12? Is it just rando-esque bags like the Restrap one, or will rack bags have enough strength to sit on a small rack? Something like this, or the Mack Workshop one but unsure how it will cope