I started off using a cardboard box (lined of course) Then I got a slab mold and cut bars in a lot of different sizes to experiment. the one I like best is 3x3x1 I haven't gotten any of this size to full cure yet so I don't know exactly how much it will weigh, but it should be four ounces or just a little over. I just put in my request for a custom TOG to accomodate my prefered soap size and shape...I've also been fooling around with the pvc pipe. Eventually I want to try HP clear soaps in the pvc.