Hi, Norm. I hope you're doing well.
I recently got a Calumet 540 4x5 camera with a 22" rail, and I found that I can fit it into a large, military-style expandable backpack. I think I got the backpack itself from Amazon for around $30 several years ago, and it's surprisingly well made. The camera
just fits into the main part of the backpack, but it still leaves room for a dark cloth in the same part of the pack, with film holders, a loupe (actually, I use 6x magnifying reading glasses, which work great), light meter, and other bits and bobs in the other pockets on the front and sides. The whole thing weighs around 15-20 pounds when fully stocked, but this isn't exceptionally horrible for hiking, at least once you work up to it.
I think finding a solution for taking a monorail camera with you is worth the extra weight over a folding field camera for the sheer sturdiness of the beast, because it's much harder for wind to shake it around during long exposures, and the fact that it's usually all metal construction (aside from the bellows) makes it even more beneficial, since there's no worry about expansion/contraction/warping in super-dry or super-humid environments. It's also much easier to clean if/when it gets dirty, since it has fewer tiny nooks and crannies for crud to hide.
So, while some will recommend getting a folding field camera instead of a bigger backpack, the money saved by sticking with a monorail and just getting something bigger to carry it in will go a long way to picking up more more lenses, more film holders, and, of course, more film. And, monorail cameras are tanks, with a build-quality-to-weight ratio that's just about unmatched. If nothing else, the extra cardio and muscle-building that come with toting it around could provide even further savings on gym memberships.
I hope this helps!