First, BPL weight of the AC60 came in at 2 pounds 14.4 ounces. Sorry we didn't get the confirmed weight in there!
In my experience fitting GG packs I've found that the majority of people fit their "proper" frame size, or sometimes down an inch. Like anything, though, fit is dependent upon the individual.
I did not independently verify the volume of the pack. Frankly, that's a whole mess that even the industry cannot seem to agree on. "Standards" are not... and while I could use the method referenced above, its most significant relativity would be to other packs measured in precisely the same way. (Even with the foam peanut method, for example... do you just pour the peanuts in? Or do you "tamp" them in a little bit? How much? Do you measure the pressure of tamping for consistency? If you just pour them in, how do you ensure that all corners of the pack are equally filled? If you add any amount of pressure on the peanuts, how much do they deform? Do you add the same amount when they're then measured in the box? Loads (wait for it...) more questions like this.) One other oddity I've found in pack volume measurement is that some manufacturers include certain pocketry, while others don't. I hope we can get some more consistency in the industry.
Performance and comfort of the Blaze have been excellent, and the capacity for loads of widely varying size has been no less impressive.
At the moment I can't recall if the following point made it into the article: I couldn't find much to cut off the pack. Actually, I decided to just leave it stock. I'm not going to rip the frame out of a framed pack, or take out the foam pad from the back, or dump the hipbelt... those modifications just don't make sense to me on a pack like this. But I have no problem trimming excess strap, removing things like ice axe loops or hydration pockets and so on... and there wasn't really any of that to remove. Kudos to GG for that! At the same time, I wouldn't plan on stripping the factory weight of this pack much lower than it is.