I've been traveling for about 5 years, and for the last 3 years traveled with the Canon EOS-M line of cameras. (65 countries, 140 cities, etc etc)
The EOS-M are extremely light-weight (optimizing the amount you carry from city to city by plane is really important).
First was the Canon M3 with an 15-45mm. The auto-focus on the M3 was horrendous.
Afterwards, I upgraded to a Canon M6 and bought an extra 18-150mm. The M6 has dual-pixel auto-focus, and the 18-150 allowed me to take longer-shots.
But my night-shots/videos were REALLY heavy in noise, so I eventually bought a 22mm F2 lens for the M6.
The Canon M50 is probably the best travel camera right now (light weight), with (either the new 32mm F1.4 or the 22mm F2.0) + the 18-150mm lens for longer shots. It also has a rotating flip-out screen (which is awesome for selfie-videos/shots)
I'm personally waiting for the next model (which is coming out around Feb/March), which could be the M60.
Basically, the canon EOS-M line is light-weight for traveling. If you intend to fly around a lot, a larger camera is just WAAAAYYY too bulky and will cut into your weight limit.
But don't get me wrong, I would love to have a Sony A9 or whatever... but too heavy (and it doesn't have a rotating flip-out screen).