Gotta go with Blossom on this, Kranu.

It might not be meant solely for the Kindle, but it's too great an option, and popular with Kindlers, not to have a place on the list.
If there were an official list, I'd pop the TravelFlex under its big brother, the XtraFlex2, if not instead of it.
I know the XtraFlex2 puts Kindle in its description, but there are issues with it - see reviews - plus it's a lot heavier. Maybe put the TravelFlex under there as "With case"?
I say all this because I did not like the XtraFlex2, but you couldn't pay me enough to let go of my TravelFlex.