Looks like Kifaru will be releasing their new pack info Dec 15 (Wed). Some testers even hauled 150lbs with the pack. Here is what Mel has to say about it.
http://www.kifaruforums.net/showthread.php?23909-Kifaru-Ultralight-Packs
"Hey guys, I see the word is out already on a couple forums, and it is true that we are about to launch a complete Utralight pack program on Wed 15 Dec. This will be the biggest launch we have ever done! The Ultralight website will be up Wed with the whole product line ready to order. There will also be an Ultralight Forum so all the info and discussion can be found in one spot. Look for it to be up on Wed also.
I can give you some info here in the meantime. The Ultralight program has been in the works for years, and is now ready for prime time. There are many companies building ultralight packs, and we in fact tested many of these. The problem we found with all the current ultralight offerings, was that though they were indeed light, they just could not support any real weight in comfort. What we have brought to the table are ultralight packs that are extremely light, yet can carry the same amount of weight as our standard packs. We will be offering a KU2200, KU3700, and KU5200. The KU being Kifaru Ultralight, and the numbers being the capacity in ci. Our KU5200 is well under 3lbs, yet can carry 100+lb loads in comfort.
All our ultralight packs will be top loaders with no zippers. They will have attachment points for our ultralight Dock n Lock pockets, and Lock n Load pockets. Speaking of pockets, there will be ultralight pockets, Pods, and Grab It.
The packs will come with our new proprietary carbon fiber composite stays. We worked with a company to develop these stays just for us. They are a composite of carbon fiber and exotic hardwood. Together these achieve lightweight and strength. We will be offering composite stay kits for all of our packs as an option.
Along with these new composite stays, we have developed our Precision Lift Plus Stay System, which allows you to choose 2 different stay lengths for each pack. Trust me, it is very slick. For example say you're a 6' 2" guy and want a small 2200ci pack. With any current offering out there you could not get a pack that small to give you shoulder lift. With our KU2200 using 24" stays, this is no longer a problem. Wait till Wed where you can see it all on the website!
Our ultralight program is so large that I could talk for days on here about it, so I will quit for now. I can answer any questions you may have though in the meantime.
Check this link out with photos from a guy that has been using the KU packs in the real world for quite some time now. He has no affiliation with Kifaru whatsoever, and writes for bow hunting magazines and blogs. Here ya go:
http://forums.bowsite.com/TF/bgforum…ages=1&forum=5
Mel"

