What plug for Vietnam/Thailand/Cambodia?

[TucSandwich]

Am going to Vietnam, Cambodia and Thailand very soon. What plugs do they use? I want to take USB plugs but am seeing conflicting advice. I'm very limited on luggage so want to get it right. Does anyone know?

Thailand had a uk plug everywhere we stayed.

I've got this, used it in many countries.

https://www.amazon.co.uk/gp/product/B0BNB7F2FJ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Vietnam varies from place to place - 3 pin, 2 pin (skinny) or 2 pin (fat). We had all three in three different hotels.

That explains why I can't find a definite answer then! I'm going to buy that universal adapter, thanks.

Buy an extender with say 4 outlets then you only have to buy one adapter!