Didn't no one tell you folk that you can't use Buckskin for a bag? It will stretch all out!!
Well, that's what they told me when I was asking....6 year later and mine is holding up just fine, seen a lot of so I guess any day now it will up and just - fall apart!
I got my buckskin from Crazy Crow but did not get their 'kit'; I got one of their "seconds" German Smoke Tan, it had one shoulder that was very stiff, not quite rawhide but apparently why it was sold as "seconds" but that stiffness was great for the back panel.
I sewed a strip of material into the strap to prevent stretching, and that buckskin sure feels nice on the neck!