85liter = 5000 cubic inches. (in case peoples don't know)
I got a MEC pack that seems to work very well for not much money. If you are having limited expedition use, maybe a cheaper pack that gets by will work out. Can't imagine doing the big pack thing on a regular basis. (ex-guide)
I think the bigger issue than what worked for mr A and mr B is what pack fits your geometry. What works for me may not work for you.