The new Kobo Forma sports an eight-inch display and weighs about 15 percent less than the Kobo Aura ONE. It might be a little lighter, but there are a lot of similarities between the Forma and Aura ONE. Like the Aura ONE, the Forma meets IPX8 standards — meaning it can be submerged for up to 60 minutes in up to six feet of water — uses the ComfortLight PRO system, which adjusts blue-light exposure throughout the day, and has a storage capacity of 8GB.
But really, you probably don't need an e-reader. I bought an e-reader from Sony years ago, and I barely used the thing after the initial thrill wore off. I've since read dozens of ebooks on my phone. People claim that phones are bad for e-reading because they have so many distractions on them, but in my experience, I've found that if the books are interesting enough they'll distract you from the distractions.
Speaking of distractions, some folks are crowdsourcing a laptop with an e-ink screen that doesn't have any other digital distractions. It's called The Traveler, and it's by the people who do the Freewrite digital typewriter.
Frankly, my favorite non-distraction digital reader is the Neo AlphaSmart 2, which is a battery-powered device that has absolutely no internet whatsoever. It's not being made anymore, so you have to buy it used.