I have this:
https://www.amazon.ca/Kobo-Aura-H2O-...case+edition+2
Works well. Though one of the magnets fell out about a year ago. The wake/sleep cover function still works though. Thankfully there were two magnets in it. A touch slippery while reading though.
Thinking about taking it off. Sticking a pop socket on my Kobo and just using a sleeve for travel.