Good packs:
GoRuck GR2
Kifaru Pointman or XRay (my next 3 day pack)
5.11 Rush 72
Mystery Ranch (anything - but their 3 day assault is quite nice - love the Y zipper)
Kelty Redwing 50 or Raven
Camelbak BFM (my current 3 day pack) or Motherlode (the Condor 3 day is roughly the same bag, but without the really comfy shoulders)