Best bet is to try it out. If you come to MAHHA in PA, we can go up into the woods and collect firewood. I'll let you carry it on the way back.
Mac will warn you that my straps are different from the new ones, though, but you'll see how it transfers the load to the waistbelt. Come to think of it, my waistbelt may not be state of the art either, plus I've modified it. Maybe I'm not the best person to ask, but I like mine. Maybe Mac will have a test model there.