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DIY E-Reader Folds Open Like A Book (Diptyx)
(hackaday.com)
This is a most excellent place for technology news and articles.
The small kobo kinda fits in a jean pocket, easily in cargo shorts or inside jacket pocket. Only comfortable for reading novels though. I prefer a little bigger even if it isnt pocket size.
I do like the old kobos. Fully hackable.
I like dedicated devices for things rather than all in ones. If you have the money of course.