None of my many Kobos survived through the years except the Aura One and the Aura 6" - all of them lived in covers most of the time. Depending on the sensitivity of the eInk screen a device won't always survive a fall, being in a cover or not.
My Oasis 2 is such an aesthetically pleasing device, I don't wanted to hide it in a cover. I bought a simple sleeve and am happy with my decision ever since.
The device is nearly 3.5 years old now without any scratches on back or surface.
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