Bike Backpacks - Thoughts and Help

Help me?

I am needing to get a new backpack for my 20+ miles urban bike commute. I carry a macbook pro with me most days and would really love one with reflective elements.

The Welded Postbag from Chrome has quite a bit of style: industrial feeling hardware, water resistant material.

The Ortlieb Velocity Cycling Backpack has bright reflective details. Love the top handle too. 

The Timbuk2 Phoenix Cycling Backpack has a lot of storage details, side access panel. Might be particularly good for airport travel too. 

I would love your thoughts, if you've ever seen, used or bought any of these. I trust you and your wisdom. Help me out.

14ft StoopidTallBike from CicLAvia

Last weekend's CicLAvia 2013 in  Los Angeles, CA saw this enormous bike, called StoopidTallBike. Indeed.

Richie Trimble explains his work:

14.5ft at the Seat
Built in 12 work hours
One Huffy beach cruiser, 2" square tubing, 3/4" round tubing, and 1" round tubing
26" single speed coaster brake wheelset
6 1/2 single speed bicycle chains (32.5ft of chain)

Music is "Contact High" by Architecture in Helsinki