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4 packs below: Click color examples below of more Dyed Full Dyneema packs.
************************************************************************************* Critical Mass Packs; Critical Mass pack developement began back in 1977. They really hit their stride in the mid 90s and were ahead of their time then....and still are! Although we sell mostly the lighter Sarc Series packs above, we sell a surprising number, in these days of 'UL', of the CM packs below. Expedition climbers, long distance challenge backpackers, hunters, and photograhers.....all appreciate the way these packs can carry a load. If you truly need a pack to carry loads that are 60, 70, 80, 90 lbs and above, do yourself a favor and try one of these amazing packs. They are not the 'standard formula' packs found in stores. They are more like what people wish internal frame packs AND external frame packs were like. They are a very different machine and the best big load packs on the market, as well as the lightest big packs. You can match the frame strength in the pack to your activity. We have the strongest dimensions of stays available. If the price throws you: a thousand dollar pack amortized over 5 years of great trips isn't so bad and they'll easily last ten years and more. The pack is not the place to save money - do that with the stuff you put in it! If you need or want to carry big loads, that activity is the toughest part of being out there - why not invest in making it enjoyable? Bypass Harness Information Critical Mass Frame Strength Information Hip Belt Info Critical Mass Lumbar Pad Information
Above: Second and third row photos from second row left: A Dyed Full Dyneema CMII, a Dyed Full Dyneema CM Bayonet Panel Loader, and a 420 CM Bayonet Panel loader, a Twin Zipper MB-CMII, a black 210 grid CM Top Load Panel Load Bayonet, Dyed Yellow Full Dyneema CM Panel loader, and a 420 Blue 'Panel / Panel' Loader.
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Photo; Jim Nelson and Mark Bebie in the North Cascades near Eldorado
Peak in 1992 with Super-Sarcs. In 1989 Jim and Mark climbed the
2nd ascent of Mt. Forakers ' Infinite Spur ' using S-Sarcs, the
very same packs in the photo as a matter of fact!
Mark's pack was made for the climb and weighed 4 lbs total, which
explodes the myth that McHale Packs of that time were ' Heavy
'. Typically, packs were as tough or heavy as customers wanted
them. For instance, Mark's pack was a relatively light construction
and used 500 D cordura. His previous McHale S-Sarc was 1000 D.
Jim's pack on the other hand was made of a relatively heavy 'medium
weight' truck Tarp vinyl like that used in Big Wall haul bags
but he saved weight by not having a frame system in the pack.
Click photos for larger images.
Dan McHale photos. 
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"Big load, long trail & hard climb, all eliminate by
my Critical Mass Alpine II Bayonet. I just focus to climb until summit
and safety down. A great success on Mt. Yari with my friends and McHale
Pack. Thanks a lot, Ben" (click image for blow-up) 