Bear Motion ® Premium Slim Case for Kindle Paperwhite and the All-New Kindle Paperwhite (does not fit Kindle or Kindle Touch) (Paperwhite, Green)
As many others have said, it turns off your kindle when you don't want it to. In addition, after a month of use, the casing on the right that has the metal embedded in it snapped off when I opened the case. It's never been dropped or smashed and it has very light usage... I mean, sure it was only $8 but I'd still expect it to last a bit longer.