This is one of my favorite water jars, not just from the Karatsu tradition, but from all water jars the world over.

I like the way it looks more like an old burlap sack than a pot, partly due to the way it was made, and partly from the firing.
Here are two I made as a sort of practice. If I can come close to the original,  I’ll be thrilled, but just getting the practice is the main goal here.
Whoever made the original really really knew what they were doing. It is coil and paddled, and about three mm thick throughout.

Also, some other pots in the works: