A buddy and I have been using the Blue Ice mono, and rather like it. Possibly a bit bigger than what you want - takes a water bladder, shell, guidebook, helmet or approach shoes, etc, with a couple of extra gear loops. The big bonus for me is the single-shoulder strap, you can unclip the underarm/chest closure and rotate it out of the way if you feel the need for a thrutch (or if you need to get at something inside).
I've been using a Kathmandu 2L water bladder, the cheapish one with the full-width crimp slide closure. Works well.
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