Comparable Alternative to Messenger Bag Hunting the internet for months for an alternative of this bag (which unfortunately isn't available for purchase anymore): http://www.alkr.com/urban-messenger.html

I searched on Amazon, Ebags, Google, Codura Corporate Website, but can't seem to find something satisfactory.

Requirements:


Solid "Codura" fabric or comparable (no leather, black, low key design)
Not a dedicated messenger bag
Structured, thoughtful compartment design (not one big compartment, fits 13" laptop somehow, medium sized)
No floppy bottom


Any suggestion are welcomed and please don't recommend the common choices like Timbuk2 Messenger. Violates at least points 2), 4) ;-)
There are so many options for this I can't list them all, here are a few good ones.

 Mission Workshop has very refined and expensive bags, very full featured multi purpose bags.

Rickshaw Bagworks has several commuter bags you may want to check out.

Chrome Bags  has lots of laptop bags in addition to their standard messenger bags.