I agree... any bag you like with the laptop in a protective sleeve.
I prefer large dome bags that have a sleeve to go over the suitcase handle. My laptop in its sleeve, a pack with electronic accessories, a magazine, my Bose headset, and my purse all fit nicely together in the dome.
I could never find a computer bag I liked. Most had too many compartments inside that took up too much of the usable space. Or they weren't designed to hold a purse inside very well. I'd rather use my own travel bags in the sizes I prefer to hold little things and keep them organized than deal with compartments.