MacBook Air 13", power adapter, Personal Router (NEC Aterm WM3600R, for WiMAX), short USB cable to charge my personal router, iPhone 5, Sony CP-EL Li-Ion battery to charge my iPhone when necessary, short USB cable (with iPhone connector), OTP password generator, notebook, and pen. Sometimes, I use a Wi-Fi spot (Starbucks is especially good for that), and don't need my personal router, but I always have the latter, just-in-case. Power becomes an issue after a few hours because my MacBook Air is old. It isn't as easy as you might think working on-the-road. Will you be leaving your laptop out in the open when you need to go to the bathroom? Noise can be a distraction when working in, say, a Starbucks that is near a residential neighborhood, as opposed to one that is near a corporate setting. Telephone / WebEx meetings are impossible in public settings.