What travel adapters do you use?

I tend to use a Kensington one. Looks like the image below. Hasn't failed me so far!

Very nice. Thanks @pugson and @pretzelhands! I was about to ask what voltage converter you use but then I realized that it's probably only a small amount of devices that can't handle dual-voltage (100-120 volt and 220-240 volt).

Maybe interesting for others is this one from Kikkerland that I just found out about:ā€¦ - It's super small but versatile at the same time.