I just came across these on a regional hiking forum. I searched BPL but could find no mention. Made for backpack hunting, the specs look interesting for folks needing to carry lots of weight.
Solo 3300-5000 ci. 3.5 lbs "130 lb + rating"
Terminus 6000 ci. 3.95 lbs "130 lbs +"
http://www.stoneglacier.com/terminus.html
I have no idea how they perform nor have I compared specs to other lightish load haulers. Just thought I'd share some pricey but interesting eye candy.
