That comment about back/knee pain is no joke.... I'm pretty much out of commission now due to on going issues with both, so I would travel as light as possible and consider everything to be expendable if need be...
[*that's the free-diving/spearfishing credo, everything is expendable when it comes to saving your life]
That Alice pack support system looks like the bees knees..... I would have loved to have had a set up like that back when I was younger and in better shape !!
If you can order one of the Marine acy'terix packs (or however you spell it ) they will fit everything you coupd possibly want in your bag and are basically a comfortable "hiking" internal frame pack on steroids made by one of the best hiking bag companies on the planet just beefed up and more durable then commercial hiking gear made for the military , and there digi camo