Shrek
WKR
The Duplex is completely adjustable to the point of it being confusing. The aluminum stays can be formed to any back and the lumbar pad increased or lessened. Each shoulder strap is individually adjustable for different height shoulders. There isn't much you can't adjust for but finding the combination of adjustment is daunting when you are a little out of the ordinary profile it comes adjusted for. Don't give up you just need to find the right tune for you.