I don't want my Kindle in a bulky cover, so instead have a silicon skin on it and use an
E-volve neoprene sleeve for when I take it anywhere.
I take care not to carry it in a bag with other objects that are likely to damage the screen, so far it's fell onto wooden flooring once, it landed on one corner and bounced. Perhaps I was just fortunate, or perhaps the combination of the skin and the sleeve were enough to protect it.