Anker Soundcore Nano for in the hotel room or any ad hoc conference calls.
Anker IE20 for moving (good for talking with Uber drivers).
Anker Powercore 1000, mostly for the tablets
Anker Powercore Slim 5000, mostly for the phones.
Anker USB-C Ethernet USB dongle.
Anker Powerport 2
Anker Powercore+ cables
Non Anker is Pixel C, Nexus 7, Moto G4 Play, Bose Bluetooth headphones (just had a 4 hour flight, next is 11 hour flight), Sony SW3 Android Wear, and the OnePlus3T taking the photo.
To make this work international just add local country adapter to the end of the extension or just to say the Powerport2.
The advantage of standardizing on USA mains and just add the local country plug is the USA plug is very compact, the PSU have folding pins, and USA extension cords can pack 3 sockets in the space of 1 UK plug.