I picked up an Outdoor Research Dry Peak Bagger pack today and I think it has real promise.
Specs:
9.2oz/263g
1650 cubic inches/27 liters
Dry bag/roll top design
Mesh shoulder straps
Sternum strap with whistle buckle
Outer pocket, open top like a hydration sleeve
Ice axe sleeve with retaining buckle.

This pack is the REI Flash on steroids— 600ci/10L larger but only 0.2oz heavier and it has the waterproof closure. It is large enough to squeak in an UL overnighter without going to extreme measures.
This is a perfect bag for using your sleeping pad rolled inside to give it support and shape. The shoulder straps are wide and long enough for a big guy to wear comfortably. As with most packs without a suspension or hip belt, I wouldn't try to carry more than 20 pounds in it.
With the roll top closure, it leaves the sleeve on the front of the back to carry a Platypus– I would use a 2 liter. I do wonder how sweaty it will be with the silnylon up against my back.
Has anyone used on on the trail?

