I think today's portable gaming system size limit is 8.5x11", as any backpack, messenger bag or briefcase can easily fit it. On the train ride I see a number of people with iPads, a few with DSi XL and one guy with an old PSP. Even though my Caanoo and iPod Touch are pocket size, I keep them in my messenger bag. The Caanoo is in a case meant for a DSi XL.