Just a quick update on my experience with the new 26" Lite frame so far...
I haven't been able to put a ton of weight in it due to a recent knee surgery having me limited, but I have had up to 30 lbs in the reckoning on it and man is this thing comfortable! The biggest positive I have noticed with it over several training hikes is it is extremely well vented. I don't notice my back sweating much at all. The frame is very stiff, but doesn't seem to transfer any load into my back outside a comfortable pressure on the lumbar pad (which is awesome). I will continue to increase weight and distance as my knee recovers, but I am very confident that this is the nicest pack/frame I have ever tried.
Also, if you are a broad shouldered guy, this pack seems to fit really nicely and doesn't have any problem conforming to my shape. The long shoulder straps and new attachment system rock. You have total freedom to move your head and can look up a really steep angle without any obstruction. Well done Kifaru! Really looking forward to getting this pack out on a 5+ day hunt.