The density of water is one g/mL or one kg/L therefore 2 liters or water has a mass of 2 kg. 1 kg = 2.2 lbs so 2 kg water = 4.4 lbs.
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About two kilos, which is about 4.4 pounds. By definition, one liter of water at 4 degrees Celsius weighs one kilogram. Different liquids have different densities, and temperature also affects the density, so there will be some differences depending on that, but roughly two kilos.
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2 liters of water at 4 degrees Celsius weigh 2 kilograms.
One ml of water (density of ~1 g/ml) weighs a gram, so 2 liters (2000 ml), weighs 2000 grams, or 2 kilograms.