Big W, frames are all the same size, just the hipbelts and shoulder harnesses that vary.
I don't believe this is true, but I could be wrong. The way the adjustment system works seems to mandate that there were actually two different sized frames. When you max out a Regular, it maxes out because the frame won't allow the harness to go any higher as you slide it upward. It isn't because the harness system doesn't have more material to give. It's the frame that stops it from going higher than 19" torso length. I know a bit about this because I'm right there on the cusp of their sizing. I could use another .5-1" on the torso length on a size Regular, but I can't milk anymore out of the frame. I have plenty of strapping to grab that slight bit more in the length, but if I did so, the loadlifters would curl around the bar and become useless.
