In Dykingas book (LF Nature Photography, I think) he shows how he packs his AS monorail into a Lowepro Super Trekker and he packs his lenses in Gnass lens cases. I think that despite being expensive, the Super Trekker is probably the way to go as far as backpacking major LF kit, unless you fancy padding and sectioning a bespoke climbing/backpacking rucsac. The Super Trekker appears heavy when empty but the carrying system is probably the best in photo backpack and once loaded and on your back it does feel lighter than you imagine!! BTW, the Gnass cases are really well made and are available from Justin Gnass via his web site,