This is one of those "ask 10 people, get 11 opinions" type of things!
You might do well to watch a ton of gear reviews on Youtube. Plenty of people walk through the popular pack systems and talk through how they use them. This is a super opinionated thing and you need something that fits your hunting style (and you) very well. If you're like most of the rest of us, in about 10 years you're going to own a dozen packs.
For flexibility, I was a huge fan of the Eberlestock J34 Just One. It's a modular system with a pull-out duffel bag and an expandable center section with load-carrying options plus a rifle scabbord. It also has a suite of matching accessories like pouches and bino harness that all work together. The idea is you pack in, pull out the duffel and drop it, then the pack cinches down for lightweight day-hunting. I just sold mine because while it was ideal for multi-day trips, I just wasn't doing that as much any more.
I'm now using a Mystery Ranch that's new to me so I'm more "hopeful" than "sure" about it. Again it's flexible but it takes a lot longer to fuss with the buckles to put it in its different configurations. But it's about 2lbs lighter and I like that the "lid" can become a day pack, so my day load is <3lbs not counting water and lunch.
For archery or day to "day+1" hunts, I use a Badlands Superday. This is a super cost-effective pack that can just barely fit a front quarter in a pinch, so I can run-and-gun with a super lightweight load, bring a shelter if I need to stay the night, and still be able to pack one quarter or my meat bag out (to save a trip) while I head down to my truck to get my meat hauler. One thing I love about this pack is it has a ton of attention to detail in terms of noise reduction. They use a felted fabric on the outside, the zippers have little covers to keep them from swinging, etc. This is my favorite pack for archery season but again, my needs may be different - when I do archery (or muzzleloader here in CO, same month) I tend to hunt from my truck, roaming a few miles and then pushing further down the road. So I don't need as much space.
Just what works for me...