A 2-liter bottle of soda weighs 4.41 pounds. The conversion factor between a liter and a kilogram is one to one. When converting to pounds, one liter is equal to 2.205 pounds.
The liter is a metric unit that is used for measuring volume. While it is not part of the International System of Units, it is considered to be acceptable to use liters within this system. The standard unit for volume in this system is cubic meters. Part of the International System, the kilogram is used to measure mass and is also accepted for measuring weight. This unit is the globally predominant unit and an official kilogram is held at the International Bureau of Weights and Measures in France.
The pound is a measuring unit of weight from the imperial system and is mainly used in the U.S. While the metric system is based around measures of 10, the imperial system uses more obscure scales. For example, 1 pound is equal to 16 ounces and 453.6 grams. A larger scale for measurement, the ton, is equal to 2,000 pounds. The imperial system uses the gallon as a measuring unit for volume. One gallon is equal to 3.785 liters during unit conversion.