Ogio Mach 5 for daily use here. Its aero and expandable so is perfect for day trip or for going to work, which is a 100mile round trip for me. for multi day trips, there's some good stuff out there, but I personally would use my Camelback BFM (because I already have one left over from my service days) with hydration and all the support and capacity required. The cameback BFM has internal aluminum/composite frame, medial torso support, lower back support, MOLLE for expansion and attachments, more suited for adventure riding, hehe.