I am making sauerkraut, and don't have a handy kitchen scale. What is the approximate volume of 1 lb of cabbage?  Also, any advice on saurkraut making would be appreciated. This is my second batch. The first one turned out very good, but I had to throw away that last of what was in the crock as it had mold on top.  I am using a Harsch Crock.   
3 pounds of cabbage should net you approximately (source) 1 pint of canned sauerkraut. Otherwise, 1 lb. = 2 cups cooked; 1 lb. = 4 cups shredded. I would recommend you just weigh the cabbage when you buy it so you can have an idea of how much it will yield. 