I've had alot, am quite demanding, and this one finally lives up to my standards.  Overall quality, organization and compartmentalization, padding, compact volume - has it all.  Most of all, I love that almost all the openings are double-zippered - gives you the flex to seal and open where you see fit, for flexibility, convenience, and security (I can't believe so many packs have one zip pockets where stuff falls out if not carefully zipped all the way down).  The only pockets that don't have double zippers arguably don't need them (such as the shallow and short seem across the top - a very convenient opening for ipod, headphones, etc).  I bought three, but since they'll never break or wear, am giving them away as gifts - so far very appreciated.