I definitely think along the lines mentioned above. The hunter is always the biggest factor in noise. Also, are you using this out west or for white tails in the east? I can see some merit to a softer material for a daypack that you may wear while stalking/still hunting for whitetail deer. If I were out west on a spot and stalk type hunt, I’d definitely drop my ruck before doing any stalking.
Even with white tails though, I’ve killed them while still-hunting wearing 500-1000D day packs, nylon hiking pants, BDU pants, heavy boots, etc. It’s all about how and when you choose to move. Even if you had some super quiet clothing and equipment, you still step on leaves, twigs, or brush against some brush and make noise as you go.
With all that said, squeaking pack frames can be bothersome. Baby powder I’ve heard helps some frames. Also, make sure your compression straps are snug. Not loose, of course, but also not cinched down to the point that it creates abunch of stress on the frame, contributing to more squeaking.