Any eInk screen will crack (to be specific, it's the glass "substrate" which is under the plastic screen that cracks) if you apply a bending force to the screen, or if you put excessive pressure on a single point on the screen. No device seems to be more or less prone to this than any other, judging by the reports we've had here.
Avoid those factors and you'll be fine. I've carried eInk devices in my briefcase for over two years now with no mishaps.
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