I turned my phone into a PDA and library. I have most of the birding books and other nature series which are sold as apps, which is why the phone. A dumb phone won't run them. A backpack full would run over 10 lbs if you have hard covers. Then you have to access the backpack for the appropriate book. By that time, the bird is gone.
The phone weighs ounces.
Have 5 good astronomy apps also. Takes about 1/2 hour to customize the phone and get rid of social and streaming sites like Facebook, Twitter, Google. Get rid of other included apps you will never use.
I use Pocketbook to read. It handles the legal DRM free downloads from the National Park Service. Its only permission is storage.
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