I have to break down the bike similar to boxing it for transport and it has to be strapped securely enough so as not to shift and throw me off balance or catch on rocks, cliff-sides, or branches when climbing along steep narrow paths.
It looks like I'll have to bite the bullet, so to speak, and make up some straps etc. to work with one of my larger pack frames. I have to walk a few miles through some bad lands, going across several cross ditches and ravines, some with good-sized creeks in them. I am used to carrying 60-80 lbs. on properly balanced packs through rough terrain. My only alternative is to 'leap-frog' all the gear, which means making 3 trips, and only going short distances before returning each time so as not to have my panniers stolen or ripped open by coyotes or bears which are numerous is this area. Anyway I look at it, it's going to be a challenge.