My Kindle Voyage is probably the biggest reason why I still read. It’s small, about 6″ by 4″, yet has a comfortable weight to it. The dimensions, of course, let me carry it around when I wouldn’t be able to transport a full book. I have eyes that tire easily when reading, but the e-ink makes it extremely easy to focus. Being able to change the font and size of the text also helps as well, since I can customize them for my own comfort.
If I had to change one thing about my Kindle, it would be the charging port–currently it uses micro-USB, but I’d like it to have a USB-C port. This is all in hindsight, of course, as USB-C was not nearly as popular when the Kindle Voyage was originally being manufactured.