the Cordura Plus is lighter than the PVC Classic stuff , and the F/R roller is simpler than the Bikepacker/Sportpacker so lighter .

maybe the Tubus extension kit for Disc brakes http://www.tubus.com/product.php?xn=35

added to their Titanium tubus - Logo Titan

rack would move the rack back far enough and the bags back further in the rack ..

(I have the steel LoGo & PVC roller bags) ..


Nice Couch ..