I wouldn't recommend it with consistant weights over 30lbs. My hipbelt would not stay tight, I had to tighten it every half mile or so. The shoulder strap where it attached to the bottom of the pack had the seam ripping out (they were not surprised by this), one of the compression strap buckles broke. The load lifter straps would also not stay tight.
On my loner the sterum strap broke off where it attaches to the shoulder strap after about 4 miles, the other one broke off a couple weeks later. It also still worked it's way lose at the hipbelt. It's load lifters also worked lose.
On the other hand I will have a slightly used Z55 pack if anyone wants to take it off my hands. I'm still waiting to get my original pack back after 2 months. One of these days I'll call them and see what is going on with it.
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