I use the Alpinestars Vector 2 backpack which has suited my purposes well and has held up very well in daily use. Thick padded straps and an elasticated chest connector to keep the straps on your shoulders. The Silver-Grey/Black/Red one I have looks pretty cool too with the bold red Alpinestars logo and my red, white and blue AMA patch glued onto it.
It’s quite tall and wide but a little limited in depth. That said, I haven’t ever been in the situation that I’ve not been able to stuff anything into it that I’ve needed. It has a large full-width pocket for a laptop inside. It also has other pockets inside, all of which fold flat if not in use, leaving more space in the main “chamber”. It also has a “hidden” full-length and full width zippered pocket, separate from the main chamber, immediately behind your padded back that’s ideal for sliding a laptop and meeting folder into. It also has lots more small zippered pockets secreted all over it and two decent-sized ones that jut-out of the sides (I put my Xena disk-lock/alarm in one and keep a bungee net and flash-light in the other). Another feature that I like is that it has a fair-sized compartment tacked-on to the back of it which is great for storing all-in-one tools and sharp items (thus keeping them away from your back in case of an accident). The cell-phone holder which attaches to one of the straps is small though (wouldn’t fit my old one-piece Nokia). There’s also a pocket on top for a CD Player, etc. with a feed-through hole for the ear-phones.
Unfortunately, I don’t think they make them any more but you might find one on close-out. I bought mine at Cycle Gear.
P.S. Looks like they’ve got some Black ones and Red ones here (no Silver-grey) although these may be Vector, not Vector 2 (?):