How to pick a USB-C charger without reading a spec sheet

Wattage, PD, PPS, GaN: the labels are confusing on purpose. Here is the short version.

Match the watts to the biggest device

Phones need 20 to 30 W, tablets 30 to 45 W, most laptops 60 to 65 W. Buy for the biggest thing you carry.

GaN just means smaller

Gallium nitride chargers run cooler, so they can be smaller for the same power. That is the whole story.

Power banks and planes

Anything under 100 Wh is fine in carry-on. 20,000 mAh at 3.7 V is 74 Wh.