Hello Gents,
It would seem that this is a good time to intervene with a small essay about our design philosophy. Most of the fit issue being discussed is due to expectations of what is "normal" with any other pack. So perhaps I need to explain "Kifaru Normal". I've done this before in these Message Board pages; I suspect it's time we put this explanation somewhere "permanent", such as in a Frequently asked Questions venue. (Mel, let's try to remember to do that.)
The idea of "carrying" a backpack "on" the back itself is actually impossible. Both the back and the pack are vertical planes...the weight of the pack means it is going to sheer downwardly (even empty!) no mater what. The ONLY really possible weight bearing surfaces are the tops of the shoulders and the lumbar shelf and hips--the somewhat horizontal surfaces. If you are feeling significant "contact" across the back in the shoulder blade area it means that you are carrying considerable weight on the tops of the shoulders! The load is "hanging" on the shoulders, which is the force that drags the pack inwardly against your upper back. Understand? We have worked very hard designing a suspension system with specifically contoured lumbar and waistbelt componentry that carries virtually ALL (depending on load--which is surprisingly high) the pack's weight on the lumbar/hip girdle. So that you DON'T feel that weight-induced "contact" at the upper back. Yes, it feels initially "abnormal" compared to every other pack you've likely worn, and that it actually a GOOD thing. It is Kifaru Normal. In attempting to get back to everybody else's normal you are in effect overiding the goodness of not having to carry any weight on your shoulders due to our design.
The pack has plenty of stability built in--it comes from the bottom, not the top. The feeling of very little to no contact across the back of the shoulders is actually liberating--it proves there's no weight on your shoulders, aids ventilation, and frees up your shoulders for unemcumbered movement. DO loosen the shoulder straps--if they feel like they are going to fall off the sides of your shoulders take that as a sure sign there CAN'T be any weight on your shoulders and loosely fasten your sternum strap to simply keep them in place. It's a great indication that you're wearing the pack correctly!
Now, edwin3060, three inches of kickback at the top is excessive, no doubt of that. Let's start over. The issue began with your thinking you were a bit flat-backed, right? Perhaps you are, but it's entirely possible you were looking for the feel in the upper back you're simply "used to". Perhaps you're conditioned to view that as "security", perhaps also as part of the pack's load bearing job. We've been over our contrarian design philosophy above, so for getting the intended benefits of Kifaru design I'll ask to put that aside and do this: I suggest you re-create the original bend contours of your stays for starters. Shoulder the pack with, say, twenty pounds of weight. Shoulder straps loose enough that the pack hangs a little below your waist. Hoist the pack up to your waist (you should be able to lean forward and shrug your shoulders upward to accomplish this if you have the strap length "just right") and fasten the waistbelt TIGHTLY; the stitch line in the belt should be directly across your hipbone points. Make sure your Delta straps are completly loose beforehand. Repeat, loose Deltas. Next, barely snug the shoulder straps (remember, our job is to put all the weight onto your hip/lumbar girdle). Then snug in the lifter straps, a little more forcefully than you did with the shoulder straps, but not excessively. Note: for tactical reasons the Zulu is built too short for most men to actually get any shoulder strap "lift" from these straps--the function is more "in" than "up". Don't do anything with the Delta straps yet. Now, stand upright. If you've done all this correctly you should not feel any weight on the tops of your shoulders. If you do, loosen slightly the shoulder straps until you don't. All the weight on your hips. Liberating, isn't it. You will also notice that "lack" of contact at the upper back. Fine. Now bend forward, as if you're going uphill...did you get contact up there? If you did, you're probably in good shape with the standard stay bend. That little bit of "freeness" at the upper back is a good thing, not a bad one. Use the sternum strap engaged only enough to keep the straps from falling off if that's disconcerting to you. You'll note that the pack isn't really gyrating all over the place...the from-the-bottom security works fine. With high loads or for even more stability engage the Delta Straps, but only snugly, not cranked. It's very possible you've been cranking those so tightly you've been levering the pack backwardly at the top--accounting for the excessive backward tilt up there!
OK. IF you still have a LOT of backtilt you may well have some flatness of back. Guys who've been told a lot they "have no butt" are pretty surely in the flat back category. Others, like Cass and Mel, are less obviously so. You may be in that category, and can benefit from some flatening of the stays in the lower, lumbar, section. If you still think you are, step on the stays right in the middle of that lower arc. Such that you flatten them maybe an inch from standard. Yep, simply step on them, one at a time. Easy and quick. Match 'em up. Then try the pack on again, repeating the steps above. Less kickback? Good. Remember, you're not trying to get ALL of it out. When you lean forward, and you feel engagement, you're good.
Get to that point and then use the pack. (Again, you may have been there all along and just didn't realize that's characteristic of the design.) See if you'll agree it's significantly more comfy than anything you've used before. And still very stable, etc. When you think about it, "contact" that's really simply hanging there is only "cosmetic" security; not really doing anything at all--sideways slippage can still occur. It just puts unnecessary and unwanted weight on your shoulders. Capish?
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