There is no such thing as a sturdy e-ink device. You can get a good case and buy a low-end e-ink reader, willing to replace it if need be. That's the route I went, along with instructions on how to handle the device and pack it safely in a bag, and my Kobo Glo survived my now-13-year-old just fine. Metal vs plastic body is pretty irrelevant - it's the glass screen substrate that is prone to breakage - it is much thinner than the glass screen of a tablet.
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