For anything within a 5 hour round trip walk I use my Lowepro backpack, but that limits me to where I can shoot. I'm currently working on a light, soft padded case for my camera, one for a lens and another for everything else. This way I can start packing my 4x5 away in my tramping pack and once I get a lighter, less bulky tripod, I'll be able to handle 1-3 night trips in the bush at the expense of a change of clothes or something else I don't necessarily need. It will also allow me to get sunrise/set photos in some of the locations I love going to, as I'll be able to shoot from a tent pretty comfortably.
Still gotta sort things out completely though. LF + tripod + tent + food + clothes needs to be reasonably well thought out.