I took a walk to reshoot an image yesterday. I only mention that it was a reshoot because that allowed me to carry only one lens and one bellows. Beyond that, I carried everything I normally carry, though I got by with a lighter tripod than usual. Total carry weight: 8.5 pounds.
Everything fits in a shoulder bag designed for 35mm: Gowland camera, ReadyLoad holder and film, lens, two filters, spotmeter, cable, loupe, hex wrench (it is a Gowland, after all). No dark cloth, as I got by with the folding shade. Velbon 343 tripod strapped on outside of bag. I don't count my baseball hat, used as a lens shade.
I mention this for two reasons. First, to encourage fellow unathletic types, that LF in the field does *not* require hauling a 50-pound pack: even the relatively feeble should be able to handle a sub-ten-pound load. Maybe you won't be prepared for every possible contingency, but you can still take perfectly good pictures.
Second, what is my light weight kit missing that other folks' massive kits include, that would allow (or help) me take better pictures? Besides of course more lenses (I can carry a total of four and still be well under 20#). What do I not carry that you couldn't do without?
I find the tripod to be the biggest carrying burden; what discourages me most from hiking with my 8x10 is having to haul the corresponding mondo tripod. With the featherweight Gowland, I can get by (just barely) with a very light and small tripod, and with a ball head.