On my K3 I had the lighted leather case from Amazon and the Smak-Dab clip that was being sold to prevent one from opening it backwards. I used to remove the clip and slip pieces of paper behind the Kindle and replace the clip if I wanted to keep it handy, yet fairly secure. I often used it for train tickets, poking out just enough that I could easily pull it out if they came by to check fares. I kind of miss that with my Paperwhite with official case as I now have nowhere convenient to stick my ticket. :-)
Otherwise, though, I don't like internal pockets and I'm very wary of anything that makes the inside of the case lumpy as I've had a broken screen (My Newton MP120) from a cover that didn't close completely.
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