Kifaru Gunbearer on pack of your choice, thank me later
Yep best I've found, carry cold chamber and head out.
I had one of the Eberle, X-1 packs,, 15 years ago, the rifle rides in a sleeve down the middle of your back. The pack was too small for me, then with the rifle touching the middle of my upper back and butt it pushed the pack further from my body. < Horrible fit for me.