I've had this Asus one for several years:
https://www.amazon.com/ASUS-MB169B-1920x1080-Portable-Monitor/dp/B013XFJKGI/ref=asc_df_B013XFJKGI/?tag=&linkCode=df0&hvadid=309751315916&hvpos=&hvnetw=g&hvrand=14065967132156473963&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9057137&hvtargid=pla-383890328341&ref=&adgrpid=67183599252&th=1--- It is powered over USB-A connection from your laptop, so
no separate power cord required.--- It comes with a nice stiff fabric case that doubles as a stand and it is incredibly light weight.
--- Asus has been making these "portable monitors" longer than any other company, they have several different versions with minor differences.
--- The only negative of the model I liked here is the screen is relatively delicate. I had one in its case inside a suitcase [during flight] one time and it cracked the screen. Every since I am more careful and only carry in a backpack.
I got this "Lepow" option for my brother 1 year ago:
https://www.amazon.com/gp/product/B07V1SQ966/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&th=1--- This one required external power, but it offers both mini HDMI and USB-C connection from laptop.
--- It's a random Chinese brand, but reviews were good and my brother had used it a lot.
--- I expect most of these are similar quality with similar screen fragility, but my brother has had no issues.
I noticed Dell offers a portable monitor now that looks to be good quality.
https://www.dell.com/en-us/work/shop/dell-14-portable-monitor-c1422h/apd/210-bbij/monitors-monitor-accessoriesI recently ordered this and will follow up with a brief review in a couple weeks.