prm, forget the "hunting packs" and go direct to those that got it right first.
Get a 90's Dana Terraplane or Astralplane.
Get a 90's Osprey Vector Silhouette or Xenith (I like the early 2000's Crescent's in 75 liters or less too).
Get a 2000's Arcteryx Bora 80 or 95.
That's about all you need to know about comfortable packs with 100 lbs... but the truth is, "comfort" is relative at 100 lbs.
Kifaru makes a nice pack too, but I can't fathom spending that kind of coin when you can pick up an Arcteryx Bora 80 on ebay for around $250 that will be as or more comfortable.
Aside, the pack in your photo isn't something I'd be interested in carrying... too squatty and fat with the weight to far away from your core... just my observation. And the Stone Glacier I tried felt like a brick on my back.
