I have the 8g version, but it fits quite nicely in a standard neo-prene case for 7" e-readers.
I'm using a screen protector for the Blackberry Playbook. Fits within milimetres. Good enough for sure.
And, just in case you want to read in the bath, a Large Ziplock baggie passes the 10 second submergence test. The also make waterproof 'ereader' cases, but I'm cheap.