The Diamond D worked well under a pack, and even when carrying a rifle on my shoulder all at the same time. However, my right shoulder did get sore after a few days of hiking/scouting with the combined weight of the pack, rifle, and harness. It wasn't as bad the following year after add in some extra shoulder exercises at the gym before the hunting season.Has anybody tried these different brands while wearing a backpack with a waist and chest belt? If so, which brand worked well? Thanks!