I'm using a PRS 300 case from Case Logic for transportation and whatnot, but I always take it out to read. I just love the feel of the well-constructed creation from Sony, especially the lightness.
Really, I like the K3 even though it has a plastic body, but I just wouldn't use the keyboard enough to have it.
That being said, I do think a case for carrying with bareback reading is the best.
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