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Apple USB Ethernet Adapter
Hotel rooms rarely offer Wi-Fi. You're often left with a pokey Ethernet port and often a free cable on the desk in your room and expect to reach barely dial-up speeds as you attempt, often in vain, to file your copy.
But the drawback to a MacBook Air is the lack of Ethernet support. You have to own a USB adapter or pay the steep price of uploading your work via a tethered phone. Your hotel room is your office away from the bureau, and when you're working on a shoestring budget you have to work with what you can. This little adapter goes with me everywhere -- just in case.