In the same category (under 2 lbs.) are the Six Moon Designs packs. With the optional (mandatory, IMHO) aluminum stays I could carry up to 35 pounds with comfort. (Well, my shoulders, back and hips were comfortable; my knees and feet were screaming.) With the stays, you don't need a pad for support, just for padding. My insulated air pad (POE) worked fine, even with heavy loads, and I'm sure my new NeoAir will work, too. Since I've had arthritis problems in my shoulders, I really enjoy the load lifters on the SMD packs.
My own pack is the Comet, being discontinued (unfortunately) but currently on sale. When I got it, I had a whole list of packs 2.5 lbs. and under, and prioritized them after lots of reading of web sites. The Comet came out as #1, mostly because for me this is a local company, so no shipping cost (just traffic jams). When I loaded my gear and put it on, it was as though the pack had been custom made just for me! I did a 3-hour hike around the house when I got it home (most boring hike I've ever done) and it still felt that way. Now, three years later, it still does!
Your Mileage, of course, May Vary. Pack fit is almost as individual as shoe fit. I hope you're prepared to pay return shipping cost for a few until you find the pack that feels custom made for you!