New pack!  It's an Osprey Atmos 65.  I got a great price on it from Amazon and I didn't even have to settle for a weird color! The difference in weight (it's almost exactly 3 lbs lighter than the White Mountain pack I've been training with) is amazing, but the real test will be Saturday morning: I'm going to hike 10 miles on the bike trail to see how it feels. It's quite a bit smaller, but just about everything seemed to fit...