PA big woods Saddle hunter here, but have also adopted a lot of layering techniques and clothing articles from what most western guys use. For me personally my K4 5K works great. The bag is definitely overkill and have never had it even close to capacity while day hunting, but I also use the pack for eastern backpack hunts as well. When initially carrying in all of my gear including camp the platform gets put in between the bag and frame, stick (I one stick) attached outside the pack and the saddle is typically between the lid and bag. When day hunting everything will typically just get tossed in the main bag along with kill kit and mid layers. Typically I have a heavier layer stuffed in the spotting pockets whether its a puffy or my Kryptek Njord jacket. I'm still up in the air on which I prefer as my Born Primitive Tundra really doesn't compress to much less then the Njord, but it is over a lb lighter although noisier. Granted when in the tree I'm not convinced a deer will hear the fabric while drawing as there is almost always noise in the woods.
With that also said I think there is too much focus on quite fabrics for whitetail hunting. You make one wrong move/noise while elk or mule deer hunting and you've blown a stalk. Typically most guys are ambush hunting from a tree while whitetail hunting, so slow your movements down and you'll be fine. The same guys that are concerned about a noisy jacket are also the same guys who will open multiple little debbie packs throughout the sit and there is nothing quite about those wrappers

.
Pack wise I've only saddle hunted so any of the western pack companies system has worked fine for me. I could see more of an issue for tree stand whether lock on or climber as there is more bulk associated to those systems. When someone truly develops a frame that can be attached to one of those and a bag to attach to the stand it'll sell, but again there are not that many people trying to get that far back with those type systems that may not make it worth while.