[natabat]

I currently use Calibre to manage all my ebooks and push them via email to my Kindle. I either read on my PW or my Android phone via the Kindle app. Now that Amazon is dropping MOBI support but not showing EPUB covers I'm ready to pull the plug and drop Amazon entirely.

Must haves:
Side load books wirelessly, and sideloaded books are fully functional. Preferably pull from the device, but push is ok too.
Seamlessly sync books and reading position with an Android phone.
6-7" eInk
Front light
Good battery life

Nice to have:
Manage collections or tags in Calibre and sync to both devices
Waterproof/durable - I have little kids and will take this to the beach, pool, camping, etc
USB-C and/or Qi charging

I can setup pretty much anything I need to make the sideload and sync happen (servers, custom firmware, whatever) as long as it makes the day to day of loading and reading as easy as possible.

The less I spend the better, but if I have to splash out to get this working the way I want, I will.

Thanks!