Hayes wrote an answer about Mountain Hardwear South Col 70 OutDry Backpack - 3975-4275cu in on September 30, 2014
The "copper"-looking stay that comes with the backpack (it actually anodized aluminum) in the above photo is installed backwards. Mountain Hardwear only shipped a few batches of the incorrectly assembled SouthCol and BMG backpacks and, once they became aware of the problem, quickly corrected it in all future shipments.
First, check to make sure your backpack is assembled correctly (the reverse of what is showed in this photo). If it isn't correct, you can easily take it out and reverse it. The next step is to adjust the stay if necessary. This is much easier in this new version of the SouthCol because you can take the U-shaped stay completely out of the frame. Before bending it, I suggest viewing some of the youtube videos on how to adjust a backpack stay (e.g. the HPG Ute Internal Frame Backpack Adjustment video]. Then bend the U-shaped stay to fit the lumbar region of your back. What I did was to first purchase from a hardware store a 1/8" x 1/2" flat aluminum piece 3 feet long and shortened the length to 26 inches. I practiced bending it to fit my back before adjusting the actual stay. This inexpensive aluminum rod is now a template for the stays of my backpacks. That is the piece of aluminum you see to the right in the photo above. If you have any additional questions, do not hesitate to ask. Good luck and good climbing! Hayes