I have had several readers, and I keep them all in book cover style cases. One of my early readers, a Nook Simple Touch, had a cracked screen despite being in a book cover style case. It was fine before going to bed, and cracked the following morning, so it had probably been stressed before then. I can't remember if the cover had anything to keep it from popping open though.
If you decide to get one, I recommend one with a magnetic cover so that it triggers the sleep mechanism and doesn't pop open. I don't think that my covers can prevent cracking the screen if the reader falls in the right way or if something smacks the reader with enough force, but I keep my reader in a backpack, and I think it adds a bit of protection all the same.
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