Quoted:
How is the suspension different btw the two packs? I wish I could try those two on side by side.
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they are the same in respect to that the waist belt takes all the weight and the shoulder straps just hold the pack to your back.
you can read my rant about the ZXR not working on the Kifaru forum, in the pack adjustment thread, the last post is by Mel, responding to me, and yes I called him and talked for over an hour. he suggested to really bend the stays. well that only helped a bit, but now the bottom of the stays were digging into my back
so that was a no go, the lumbar pad on the Kifarus is pretty lame.
which brings up another point, that you don't have to adjust the 100 different straps to get the thing on and fit you. although I think the the power-pull waist belt adjustment is pretty slick and I might try to make something ( plastic loops from supply captain ) that does the same thing.
here's some info from the Mystery Ranch web site
Overkill Guide Frame
The Overkill Guide frame is the ultimate internal frame. Stiff framing, aggressive load transfer and flexible harnessing make this pack a dream with 60 to 100 pounds. Two fiberglass composite rods run parallel behind a strong plastic framesheet to create a highly stable mainframe that insulates your back from the pressure of heavy loads. They also provide a direct channel along the length of the pack that transfers the load to our patented Five Segmented Lumbar Wrap. The Overkill Futura Yoke is two inches wider than the Futura Yoke used in the standard Guide frame packs. This extra two inches with the addition of dual aluminum stays reduce any sway to a minimum for better stability with those really heavy loads.
Overkill Futura Yoke
A Velcro anchored telescoping yoke system that can be adjusted to fit your torso length. This yoke is much like the Futura Yoke but two inches wider and it has two aluminum stays instead of one. The added framing and width increases the stability and strength of the yoke. Once the yoke is properly adjusted, the curve of the aluminum stays automatically contours to match the shape of your back. The yoke is available in three different sizes to ensure the perfect fit.
Cush Lumbar Wrap
This lumbar system consists of five different segments that can move independently of each other to perfectly conform to the specific structure of your waist. The ensures complete contact across your lower back and waist distributing the weight more evenly to decrease pressure points while increasing support. A molded outer shell with 3D shaping structures the waistbelt segments to decrease sag. The shells are lined with a soft open-celled foam pad that provides the cush and doesn’t get slimy when you sweat. Dual densities of foam are combined to make the lumbar pad cushy and breathable against your body while retaining the stiffness needed for effective load transfer. An aluminum stay sits behind the center segment to shape the lower portion of the pad to the curvature of your lower back. This stay extends upwards towards the middle of the pack to integrate with the upper bag framing. Interchangeable waistbelt pads come in three different sizes to insure a great fit.
I'll post some pics of the back pouch and pod on the pack later.