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I worked in tech consulting, and my colleague actually had a very thin ~23" (IIRC) portable LCD screen he somehow carried with him on planes. It had a foldable kickstand so he could set up a dual-screen on any hotseat desk in seconds. It was brilliant, and I briefly considered the same, but my backpack was already heavy enough. I've heard of folks doing this with the MBP + a iPad Pro, but idk how well that works.

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I keep looking at those, though in the 12-14" size. I'm interested and can see use-cases.

But - you can put those to the side of your regular monitor.

It's replacing the keyboard ("underneath" / looking down from my primary screen) completely with a full-size second screen, that I don't see myself doing just yet.

It works very, very well with the "duet" app. Duet supports Windows/Mac along with any recent iPad (or even iPhone).

The upcoming version of MacOS supports this natively but it's not clear to me yet how it will compare with Duet.

It’s startlingly good, even wirelessly. I spend a lot of time working between different offices, and being able to set the iPad up as a secondary display is very handy.

The iPad display also gets its own touchbar instance, and it makes way more sense as a thin touch control strip at the bottom of the screen than it does as a function key replacement.

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