I don’t like those “wall wart” chargers nor the “all in one” international adaptors.

The biggest problem is that the wall warts frequently don’t make a strong enough connection to the wall so gravity pulls them out (weight/strain added by the cable etc). Plugging that into a huge adaptor like the massive one recommended by the author simply compounds the problem.

The second problem is that power points are often inconveniently located behind things and/or high on the wall, and not always where you want to be.

So instead I use small standard IEC 60320-C1 (AKA “figure 8”) power cable. I carry a US/JP kind and European kind, plus a couple of tiny adaptors. The good thing is if I don’t have the right adaptor it’s easy to find one of these cables anywhere.