Aron has a new video about fitting the platform frame. I have a tip for positioning the 3 bar slider where the load lifter meets the shoulder least for most folks. The older Kifaru packs had two seems on the shoulder straps about 5 inches apart, and that slider was positioned half-way between the two. The newer shoulder straps do not have that spacing, its quite a bit more to avoid hot spots. So, I recommend placing the middle of the 3 bar slider about 2.5 inches above the lower stitch line. That will give the same position as most are used with the older frames and allow for proper strap length adjustment with the 3 bar over the collar bone.