I just bought Russel outdoor gear this past year on a great discount. Mossy Oak Brush Pattern. I believe they still have most everything at Cabela's on sale. The pants are more bibs for the heavier stuff though, just as an FYI. Its a lot cheaper than Sitka or Kuiu, but they are all great brands.
As far as packs, I have a Horn Hunter mainbeam with hydration pack. We hike roughly 10-15 miles depending on the day and I have packed parts of deer out with it as well. You can also strap your bow or rifle to it with no issues. My dad has two Eberlestock pack loves both of them, but since I haven't used them I can't vouch for them but I have heard good things. I would recommend a water bladder. Less noisy than plastic bottles and you can fit a bunch in there.
I think the most important thing you can invest in is good optics, 8 or 10 power, and a great pair of boots as you will be using both a lot. If you can swing it, take two pairs of boots, but if not, invest in a boot dryer if the place you are staying at has electricity. Can be a lifesaver if your boots start to leak or you feet sweat too much.
Make sure you can fling some arrows at longer distances as well and Good Luck! I wish I had a buddy willing to take me on a high country hunt!