Here's an amazing fermentation crock design I ran into via a FaceBook friend:
counterculturepottery.com.
According to my friend:
Very well designed. The lid has a deep well for creating a positive seal, it comes with the ceramic weights that fit inside, and it's straight-sided, and heavy to maintain an even temperature. Can't wait to start a batch - had been using food-grade restaurant plastic tubs because it's easy to sanitize and control compared to random ceramic jars you find at garage sales etc., but this will be sweet.
The lid sits in a water well for the seal. VERY pricey at $200 each plus heavy shipping if you're not in the Bay area.
Though I imagine the market is growing for these and pottery folks in all areas will be adding them to their repertoire, soon.
(photo credit
https://www.facebook.com/liveculturepotter)