I second the Kestrel packs. I started with a 58, which held my summer load with some room to spare and my winter load comfortably. As I replaced a tent and a couple other things that shrunk the bulk, the 58 was way too big. Now, I can fit everything into the Kestrel 48 with room to spare, and enough room for my winter load.

Great pack - not the lightest, but a sturdy suspension, just enough features (actually, one too many: I don't use the sleeping bag compartment access), fully adjustable torso, and a very comfortable ride.

I ended up getting a 28 for dayhiking.