The Case I Used for My 11.6" Laptop Was Bigger Than I Wanted

It was originally for a 14" or 15" laptop.  It was not very heavy, but my wife complained that its exterior dimensions made it clumsy on airliners.  She was right.  I bought this instead.  Several inches smaller in width and depth still with a crossbody strap.  The power supply brick, a spare battery, and the wireless mouse all fit in center and side pockets.  Takes up less space under the seat or in the storage bin. 

Nice touch: on the back of the case is an elastic strap that exactly and tautly slides over the pullout handle on the rolling suitcases.  One less item to carry over the shoulder on your way to the ticket counter and from baggage claim.