If you can afford them I've never seen anything that tops the PAC bags as work bags. The X-strap and the ridiculously over-the-top construction makes them just about the best investment you can make. The problem is that they are really expensive (fair when you look at the workmanship and materials) and it can take awhile to get your hands on one when your order them.
Curbside did have the Chrome backpack when I was in there last but they have been shifting around stock so quickly that who knows what will be in there next time.
I'm personally saving for a beatiful PAC deluxe with X-strap, hidden pocket, lock strap and a custom front panel <drools> but first I need my frame to finish being airbrushed (can't hurrt art though) and built up so I can enjoy spinning when its THIS NICE OUTSIDE.