Bottled water comes in sizes as small as 8 ounces per bottle and as large as 2.5 gallons per fridge pack. Purified water may also be bought in 5-gallon jugs for use with commercial coolers in offices and warehouses.
The most common personal water bottle sizes are 16.9 ounces, equivalent to 0.5 liter, and 1 liter. These standard sizes are related to the standardization of measurement across the globe. Some U.S. companies still sell traditional 20-ounce, 32-ounce and 64-ounce bottles of water due to U.S. preferences for ounces. Anything over 1 to 1.5 liters typically also reverts to traditional fluid ounce measurements.