I tend to underestimate the amount of clay I need to make a certain size pot, so I am weighing clay on my cheap IKEA scale and jotting down notes. That way, when I throw a certain shape I don't run short. I just hate when that happens! The jar is 5 1/2 inches tall; with lid 7 1/2 inches. Pot sizes: we're movin' on up! The shrinkage rate during firings still amazes me. The solution: more clay, more clay, more clay. Play-time comes when I have to make the knob. I know I spend way too much time carving out grooves; adding swirls and just messing with shape in general but I can't help it. For me, that's the best part.