I've been using this one for my rm1 since 2018. Works great and still looks good.
KuRoKo Case Cover with Hand Strap and Pen Holder for Remarkable 1
it doesnt fit, so this is the only choice https://www.amazon.com/gp/product/B07CWNFKT5/ref=ppx\_yo\_dt\_b\_asin\_title\_o00\_s00?ie=UTF8&psc=1
I have been extremely happy with the Kuruku Premium cover I bought at Amazon. It fits well and after a year of daily use still looks and feels great. Yes is a folio but really excellent cover for the price
Cover Info https://www.amazon.com/dp/B07CWNFKT5/ref=cm_sw_r_cp_apap_mMI5tW3mcNbVs)