I store/transport mine in a nylon sleeve case and it's great peace of mind when it comes to what else surrounds it in my bag/luggage/whatever. I do read it caseless though, and this includes on the subway every morning, and I only occasionally bother to put it back in the sleeve when I transfer trains. IMHO, it would be insane not to have something to protect it when you're not reading, but as for reading without a case, probably OK. Just keep your head on straight and don't punt it off the couch while you're sitting there.
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