After looking for a week, its difficult finding backpacks for someone over 6 feet tall.
Common torso lengths are 15-18 inches. My torso is 24 inches. I did find 3 backpacks; 2 internal frame and 1 external frame; that might fit me. One is $110, and the others are $200 and up.
Hopefully I can find one I can afford and it fits well.
update: July 4, 2015: I found one on Campmor’s site for $110. On its way.