One of the lighest weight large screen monitor especially 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". 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.
