Ereader

I just run KOreader on my Minimal Phone (e-ink android phone). Wouldn't necessarily recommend it just as an e-reader, though, unless you're also trying to cut down on screen time or phone-based distractions. But since it's my daily driver, it's great for reading since that's about the only time-waster it's good at. That, and Sudoku.

I've been looking at the Boox Palma but may wait for the Picco I just saw today.

The nice thing about using these smaller devices is that when I pick up my Kobo, it's like reading on an IMAX screen lol