Marshall’s Water Bottles are available in an Economy version or a Big Mouth version. The Economy version has a 16 oz. capacity, is made of durable plastic and has a 2” stainless steel drinking tube. The Big Mouth version is also made of durable plastic and has the 2” stainless steel drinking tube; however, it has a 32 oz. capacity, which is perfect for multiple ferret households, plus a wide mouth for easy cleaning.