My take from the viewpoint of a lightweight backpacking forum participant:

1. Devise a long-term plan to simultaneously upgrade/downsize your photo kit. There are vanishingly few things left that only a DSLR can do, with the remaining gaps continually closing. This is, of course, a huge financial commitment but given the opportunities to get farther into the backcountry carrying less, the rewards are there.

2. For now you can perhaps lug all that stuff in load-hauling packs intended for the infantry, climbing expeditions or hunters. Two brands I'll single out are Kifaru and Mystery Ranch, started by the guys who were Mountainsmith and Dana Designs, respectively. They know pack fit and by reputation the stuff is quite tough and well-built.

BTW, this is how that Adams fellow did it.



Cheers,