JoyReal - Portable Touchscreen Monitor B0C776ZZBH

UPerfect brand has been fairly reliable for me. That said, a 4k monitor under 17in provides little visible benefit especially for movies, and may be troublesome for you because of how sensitive almost all monitors are to cable quality and signal dropout -- most will drop down to 30hz at 4k unless you also drop 50 bucks on a very good cable and treat it with utmost care. After going through about a dozen different portable screens, the ones I find most useful are FHD with a built-in stand (not a floppy cover, just slide it in facing your laptop for travel) and vesa mount holes. For work, I found this dual-screen one ( https://www.amazon.com/dp/B0D45LM2S7 ) to be a true game-changer, with the effective total screen size of a 21in monitor, and it works on windows and linux without a driver or any hassle. For an ultra-compact alternative have a look at this one ( https://www.amazon.com/JoyReal-Portable-Touchscreen-Extender-Temperature/dp/B0C776ZZBH/ ) with a smaller screen but built-in speakers and stand, great for streaming movies and good sound. Lastly, the largest single screen that would still fit in a normal-ish laptop bag is this one ( https://www.amazon.com/UPERFECT-Adjustable-Ultra-Slim-Lightweight-Frameless/dp/B08L5SRCZJ/ ) also with a great built-in stand that protects ports while not in use, but the price jumps from ~150 for FHD to 350-500 for the 4k version.