Trailz, Have you successfully gotten your R20 on a train yet?
I was thinking about getting some sort of duffle bag for my R20 so that I could take it on an airliner as checked luggage. To help protect it I would probably line it with some cardboard. Also want to keep it under that 62" oversize limit, which I imagine would be harder to measure with a bag.
I like your bag. But I was wondering if anyone has ever tried using a military style sea bag. Those have the benefit of shoulder straps and can generally carry a lot.