I carry mine in my Targus CityGear bag.

It comfortably holds my EE, MiniGorilla, LiveScribe smartpen and one blankbook, external drive, headphones, appropriate cables, wiping cloth, a pencil, and an extra battery for my droid. There's an extra pocket in the back that I don't have anything in. The whole thing fits into the laptop section of my Synergy backpack, which also has textbooks, pens, flash drives, external CD-drive, netbook, power adapter, mini-USB keyboard, etc.