I have a KreatedbyKim sleeve and it works great for me but be aware: it's bulky. It's very light because it's all fabric but because of the padding (which is necessary for protection!) it is not thin at all. Also, you take it off while you are actually reading so no protection then.
I would think something like the official iPad cover which is some kind of rubbery material, very thin, would be great for Sony but I've never seen anything like that. The case selection for Sony is pretty slim pickins.
eP
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