Looks like you found your solution. I was going to recommend some of the dry bags attached to the frame for meat. You went ahead and got the whole rucksack. Good deal. Looks much more ergonomically correct than the shit I had on my back when I carried one.
Well after a Youtube Video, I got the straps all hooked up to the frames tonight on the packs. Now I just need to get some HD zip ties to hook the frames to the stand.