It can be used for both water and food, depending on the position. In addition to being very versatile, your hopper is semi-transparent so you can control your pet never run out of water or food. Available in three sizes with two possible uses. Capacity: Small - 650 ml Medium - 1,5 L Large - 3,5 L Diameter: Small - 7 cm Medium - 9,5 cm Large - 11 cm