Once upon a time I travelled with a heavy current converter and a handful of plugs to fit a variety of sockets outside the U.S., all in a bulky case.  Now that so many electrical devices have dual voltage, the issue is to find a convenient plug adapter, and this one fits the bill.  It's very cleverly designed so that all the plugs snap together into a single compact unit - no more lost parts! - and it has the added benefit of a USB port for charging MP3 players & the like.  Add to that a super-reasonable price, and I don't know how you could ask for more.