Review on CUIUIC Upgraded 17.3" Portable Monitor - Mountable, Ultrawide Screen, Wall Mountable, OTG, Flicker-Free, Lightweight, HDMI, 60Hz by Tony Kucrud

This thin and light monitor is as portable as it gets. It comes with a magnetic lid that protects it during transport and doubles as a stand. The display is bright and clear. It has no internal battery, so it must be connected to a power source. It would be nice if it could run on battery power for a while for temporary use. But I think you could do it with a power bank. It's powered by a USB Type-C port and comes with a charger and a USB Type-C cable, along with some other cables to connect to the HDMI or USB Type-C ports in case your phone or tablet has one supports an external display but mine doesn't. I often seem to be looking for a display to connect to my Raspberry Pi or a computer I need to debug. It would be nice to be able to tow this lightweight portable device.