I bought a Briggs & Riley briefcase (VB403x-4) something like this:

http://www.briggs-riley.com/category...1&sec=business

(It looks like the model I bought is unavailable now)

What I like:

Compact, but expandable

Has color accents (Small amount of orange stitching) makes it easy to distinguish on a security machine belt

Has separate pocket for smaller things like pens, passport, etc with a key ring, phone pocket and the like

Separate front zippered compartment which takes charging cords, etc.

Sleeve on the back that slips over the roll aboard handle.

Briggs & Riley also has lifetime warranty.