Bipod. Atlas or Modular Evolution. Still working on my preferred rear rest. Most are not stable enough to have the consistency I’m after for vertical while keeping weight down.
I have an Outdoorsmans head on my tripod and one of their shooting rests with 2 yolks to hold the rifle. I find the 2 points of contact to be more steady than a single Y. If I don't have time to set that up or I can go prone I'll use my pack.
My heavy 264WM for shorter hikes I have set up for the Rapid Pivot bipods. If I can I will use a prone height bipod on the front of the gun and my pack belt under the back of the rifle. I use the same optics tripod for higher shooting positions.
I’m a fan of using my trekking poles interlocked in the wrist straps, they serve a dual purpose this way and it’s just one less thing to carry up the mountain in my mind
I think it depends on shooting distance. For shorter range or still hunting where you’ll likely be shooting from standing position I like the trekking poles. For long range shooting I like bipods with a pack or jacket under the butt.
I have carried the stoney point short sticks for years, but I am starting to leave them behind. My lighter Tikka has helped that decision. My favorite if I have a long shot from a setup is to use my mini tripod. Turn the pan handle up at about 45deg and it makes a super rest.
I just bought a set of treking poles and one of the first things I did after adjusting them was to see if the straps could be used for shooting off of. Glad to hear it works. My rifle is already too heavy to have a bipod.
Whatever is handy. The last time I hunted mule deer for myself, I leaned against a saguaro cactus on order to steady the rifle. Was a long shot on the last day of season and only had a few minutes of legal shooting light remaining. The saguaro came in handy for that one.