Since Harsch quit making the air lock crocks when I went buy a couple more I ended up with a more pot belly shaped crock. Since they sit on the kitchen counter while fermenting (so I can, in part, remember keep an eye on the water level) we thought that the pot belly was more attractive and it certainly is. However, when go to fill the crock with the cabbage mix it is much harder to tamp down. With the belly shape the cabbage pushes up the opposite side of the crock. In other words, if you use your fist to pack down the left side of the crock, the cabbage comes up on the right side due to the curvature of the side walls. If you pack the front it comes up on the back, etc. I got it done but would rather have had the straight sides in hindsight. Lesson learned.