Trouble is that the bagman weight is a bit over 300g, my lightest standard rack is bit over 700 although you could spend a fortune on a Ti version, the Topeak seatpost ones are still 600g+ , maybe the "road" version is a bit lighter as it supports lighter topeak rack bag models. Hard to find a solution that doesn't double the weight? I have a shed full of bags that seemed perfect but which each exhibit some fatal flaw, only exceeded by my collection of saddles that reviews said "99% of users would purchase again" but which don't work for me (I'm special it seems)