The 18 oz. shaker is used to cap a 28 oz. shaker much like the 16oz. The main difference is that the 18oz shaker sits higher inside the 28oz to allow for more liquid content inside the shaker. The 18oz shaker is still small enough to be used as a cheater tin. This shaker has a reinforced bottom, which is also known as a weighted shaker. Same high quality stainless steel.