This is still available.
I'm really sorry for not responding to the question about the torso length -- I clicked the link to watch the thread but never received an email that there was a new post. I know somewhere on BPL, there is a full review of this pack, but I can't find it now. My torso is 16", so I would think the ideal sizing for this would be 15" or 16" to 18" or so. The shoulder straps are about 3" wide.
Please PM or email me if you're interested or have any questions. knitmoresocks at gmail dot com.