Originally Posted By Glenn
I've only loaded my Deuter to about 30 pounds, but it carried it just fine. Also, on Backcountry Gear's website, it lists a 45 pound capacity for the ACT Zero 45+15SL. It's also about a pound a quarter lighter than your present pack.

I've loaded the ACT Zero 60+10 to 40 and it carried great. I've also loaded the Osprey Atmos 50 to about 40 pounds and it was also fine. Both seemed like they could probably take a little more weight.