Since one backpack is never enough...
For those times when I have to haul more weight than a human being should be allowed to carry, I own a Dana Design ArcFlex Terraplane. Built in Bozeman, MT before the buyout and ruination of the Dana Design brand.

http://www.trailspace.com/gear/dana-...ex-terraplane/

http://bedrockandparadox.com/2013/10...-packs-worked/

Wayne