I've realised that when cycle touring the only reason I take a plug adaptor is to charge my tech using USB. This tends to be my Apple charger with single USB port so you have to be on the ball when charging and queue for charging. A USB Plug Travel Adaptor with 4 Ports is a good buy since you can forget about your plug adaptor and USB plug and just take this one. Not only is it compatible with EU and US plugs it also has a UK adaptor so you can use it all the the time not just on tour.