Although a bag and not a bump cover, I can warmly recommend the “flip” by Mapbagrag (old Jolla partner from the Jolla Tablet days), it is tailor-made (just mention “Reeder S19” in the appropriate text field) and made out of Tyvek, a synthetic material with a paper-like feel: https://mapbagrag.com/Handy/ (in German, but they send to most of Europe).
I’ve used a “flip” for many years with my Jolla Phone, the prior still looking flawlessly today (and not because I only used it with velvet gloves during those years).
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