Although most business-class hotels offer 110v outlets and outlet adapters from the concierge desk, I’ve always found it helpful to carry a plug adapter of my own, so that I can plug in my laptop in airports, budget hotels and local homes.  I used to travel with a bag full of plugs, but now just one.  By sliding out the appopriate blades, this plug adapter works in 130 different countries.  Remember, it’s not a voltage converter, but since most laptop power supplies work from 110v-220v, you may not need one. $12.99 from Amazon.com. (FYI, when referring to a device, either adaptor or adapter is correct.  When referring to a person, adapter is the correct spelling.)