I'm surprised to see so many 3+ pound packs in the "UL" categtory. I've often looked at anything over 2 pounds as being in the lightweight, but not UL, category.
For example, I like the REI Cruise UL. I work for REI, and I am ecstatic to see REI make a strong quality lightweight pack at a great price. But at 3 lb, 3 oz, it is well beyond what UL'ers would consider ultralight. It is lightweight, but you would be somewhat challenged be stay below the 10-pound cieling when starting with a nearly 3 1/4-pound pack.
With this in mind, none of my current packs, the Gregory Z-55, REI Quick UL 45, or ULA Catalyst would qualify as an ultralight pack.
But then, my base weight is usually between 13-17 pounds anyway, so I don't consider myself an ultralighter, just a lightweighter. Thus my lightweight packs work just fine for me.
Now when the ULA Ohm comes out, I will likely take this plunge........