I use Kifaru Gun Bearers on both day and multi-day hunts. Can be attached to any pack. It can be attached to the side of the pack or under your arm for quick and easy access. (
https://kifaru.net/store/accessories/gun-bearers/gun-bearers/)
The Kifaru Gun Bearer on, an EXO Pack ( yes, the Pack is, a little Taller than, a Day Pack but, so IS, the Rifle ), this "set up" is what I've used, the last 5- 6 years and I HIGHLY recommend them, BOTH.
I stuff, the Pack with Puffy Pants / Jacket, Lunch, Water, Kill Kit, Gloves, etc. and shoot Prone off of it ( with a Toe Rest )
I use wood, Hunter Specialties STIX ( strapped to the back of the Pack ), for shooting in, Sitting Position on, side hills !
Got 2 Elk, One Kneeling with Stix shooting over Sage Brush and one from Sitting Position, on a side hill and, a couple of Yotes with, this set up.
My whole Family uses, EXO Packs, Kifaru G. Bearer's and Wood HS Stix !
My grandson killed a 3x4 Mulie, 2 weeks ago, over Stix.
He carried Rifle, in the Gun Bearer, used Trek poles, to, top of ridge, in the Dark, by headlamp, to "set up" just before, Daylight, Shot was at, 268 yards.
My son killed, a real Nice Bull, a couple of years ago with, SAME set up ( sitting at 247 Yards ) using Pack, on Chest, to stabilize, the Rifles "Toe".
The Gun Bearer also allows you to, use Trekking Poles as you are,.. "Hands Free", to Hike.
After making a Kill, we strap the Deer or Elk quarters on, the EXO Pack and walk back to the Truck & ONE Less Trip, IF you have a GOOD Pack with, you !