Wine is mixture of water, ethanol, and trace amounts of other compounds, including residual sugar. The specific gravity (relative density) of wine is somewhere between 0.990 and 1.010, or 1.000 plus or minus 0.010. In other words, it's about the same as pure water. Since water weighs one kilogram per liter, one liter of wine is also about one kilogram, so 750 ml of wine weighs 0.75 kg, which is about 1.65 pounds.
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This is not a valid conversion; milligrams (mg) and grams (g) are measures of weight or mass while milliliters (mL or ml) measure volume.