Ugh? I don't know any other mini-computer that is as portable as the Pandora. Sure, many handheld game consoles are smaller, and of course any phone is smaller, but those are not general-purpose mini-computers, those are special-purpose devices.Let's be honest.
Pandora has many good things and, nowadays, I think it´s the best open-source console or micro computer you can get. But this level of portability is not one of its strenghts.