That is a good tip. I have a ton of slings, including a skinny one. I'll throw the pack on and see where she sits.I don't carry much when I'm out stalking elk or deer (or uplands). Everything I need fits in a daypack or the game bag of my vest. I have found skinny slings work best. The pack strap will keep it between the strap and my neck. Fatter slings resting atop the backpack strap have tendency to wander off and slide down the shoulder.
Another vote for the Kifaru Gun Bearer. It is a little adjustment, but after you attach it and pull it off a couple times it is hardly noticable. As far as getting in the way, it is very easy and natural to reach ahead and hold branches out of the way. I even set my binos on top of the barrel to glass (empty action!). I still end up carrying my rifle in my hand a far amount when still hunting, but it comes to hand very quickly and easily out of the gun bearer as well.I took a look at the gun bearer. The site I looked at was sold out but had a few video reviews. Is it a bit awkward to carry the gun like that at first? I'm so used to having it on a sling or just carrying it, that it seemed like it would be in the way between my torso and arm.