All-in-One Kit for Your Starter to Thrive: You will get a starter jar (47 oz.). Plus, we include a non-slip pad to keep the jar steady while you stir. 47oz Large Wide Mouth Jar: Our 47 oz. jar boasts a spacious 4.6" wide mouth, ensuring easy addition of flour and water without any spills, while providing ample room for your starter to thrive healthily.