I've now had the TZ-2220 pack out for three scouting trips. I've loaded it with between 12 and 20 lbs of gear and water on these trips. The July temps have been between 85 and 97 F (HOT!). The pack appears to be put together well with good quality materials. Strap, pockets, access are well thought out.
The Pack is comfortable and rides well on both shoulders and hip. The ventilated back panel does seem to work, at least as well as anything can in this heat. It does breath better than my ALPS pack or any pack I've had with maybe the exception of my around town Osprey day pack.
I have not hunted with the pack yet. I did strap my bow to it and it seems to carry it well but the the proof will be when I'm hunting and climbing with it.
Verdict so far: Highly recommended.