There seem to be a lot of MYOG packs being made recently, and they all (ok, maybe not every single one, but most) share a common problem. We don't have square shoulders. Yet everyone is sewing their shoulder straps on at 90 degrees. This kind of configuration, and the resultant weight distribution, can cause unnecessary soreness, numbness, and even permanent nerve damage. The average slope of the male shoulder is 67.5 degrees **, and shoulder straps should be sewn on at a similar angle so they lay properly on the shoulder. Women have a slightly different slope and should be adjusted for accordingly.
** This was medically studied and published.