I haven't experienced any problems with either my Conterra Alpine Crag backpack (my winter pack) or hauling one of my team's Conterra ALS Extreme Packs.

Initially I was concerned that the upper pocket I use for my VHF handheld radio would interfere with the Conterra pack's shoulder strap. It hasn't been an issue. Also the waist belts on both packs rides just below the bottom of the vest. So there's no intereference there too. If I was to add a duty belt to the bottom of the vest, which it is set up for one, then the pack waist belt would ride on top of the duty belt.