The Lenovo Yogabook C930: a dual screen laptop with no keyboard but a eink display instead. It is light, very thin, and USB-C. Both screen are tactile and wacom pen enabled. The laptop folds at 360 so you can use either screen.
But the best is when you hold it in portrait mode like a book to display the paper on the color screen on one side, and take notes on the eink on the other side with a pen.
Even better: with the 2020 update, set the eink display to "clone" and select the option to turn the screen off, and you have a eink laptop to read technical paper in the browser, BUT in eink so it goes easy on your eyes.
It only serves one purpose, but it serves it perfectly.
It's replacing my Sony 13' DPT RP1 eink reader, thanks to its better integration with OneNote, and also the "side uses" (you can use it as a eink laptop or screen by hooking a USB keyboard. vi on eink display is a pleasure to code with)
I would suggest the 256G version to have lots of room for content as it's the ideal device to consume media on (mostly book) ; a few resellers still have it new-in-box. If you can afford it, get the Korean model on ebay, with LTE enabled - it's a Fibocom L850-GL CAT9 WWAN Module II which is has an Intel xmm 7360 insde, so it's multiband and will work everywhere.
Don't get it used or open-box returned due to a bug on the charging side: if you try to use the yogabook at 0% battery but with the AC plugged, REGARDLESS of which AC adapter you use, it won't draw enough power.
This means it will turn itself off in a few seconds, but right after damaging the battery - 10% loss of capacity is easy to do in just one day when trying to do the "first boot" if you are not patient ...