So I have carried all kinds of laptop bags. I have a Kenneth Cole, Timbuk2 (one of my favs) but my absolute favorite that I have been using for travel is my Oakley Icon 3. Going back and forth to Australia and New Zealand over the last 3 years has made me fall in love with this bag. I use a black neoprene sleeve for my laptop so when I go into business meetings I am not carrying the backpack.
Seriously, this is the best bag I have ever owned. Couple with a small carry on I can bring just about everything with me for a trip. If you are looking for a laptop backpack vs. a laptop bag, you need to check this thing out. I would have paid more for it than I did.
What kind of laptop bag do you carry?