I got a backpack one. I can carry my gym stuff in it when I am not traveling and all my files when I am. The laptop sleeve slides out easily to allow it through security.
Here it is a McKlein:
http://www.ebags.com/mcklein/m_serie...?modelid=57796

It looks very professional. I also have a B&R one that I like but it doesn't carry my gym stuff at all so the backpack ends up being the prefered one.