I've got to give you props. Your brain is wired differently than mine if you can sit sun up to sun down without ever looking at your phone or reading anything. I love being in the woods and hunting, and for me the ability to relax and read a few pages here and there keeps me out longer and helps keep me still and not fidgeting. And I definitely love nature watching with my binos while I'm out there too.
I think a Kindle is the best option and is what I do the majority of my reading on day to day.
I picked up this case for use while hunting so I can clip it to my tether or gear strap:
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