Physical format wise, the Asus ProArt PQ22UC can not be beaten. Slim everywhere, no bulging for connectors, slick folding stand, light weight (only 1.5 kg without stand). It is also an ~5000 USD professional 4K OLED monitor which pretty much rules it out for travel. Wish a similar monitor existed with a far cheaper panel but same package.

One of the lighest weight large screen monitor especially well suited for travel is the AOC E2351F at 2.5kg official weight total. The monitor can stand on it's "easel" and if you wish to lift it off the table and travel with the stand, you should know the tube part of the stand comes off with a single screw which is very easy to manipulate by hand -- it's not a thumbscrew it has a "flap". The base of the stand is plastic, further lowering weight. I looked far and wide and this is pretty much the only monitor doing this except for an even older slightly smaller AOC which was DisplayLink so that's garbage. This one also uses a 12V AC/DC adapter with a 5.5mmx2.5mm plug which is easy to get very lightweight variants of. Any monitor which has a C13/C14 connector is IMO too thick out of necessity to be suitable for travel, the AC/DC adapter needs to be separate to avoid the bulky connector and to make it easy to convert the plug internationally. A C7/C8 could work but for some reason I never saw any doing that.

[![enter image description here][1]][1]
[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/yuMlw.jpg
  [2]: https://i.sstatic.net/D7Rg7.jpg