1 liter = 33.8140226 US fluid ounces. 1 US fluid ounce = 0.0295735297 liters. Note that this is for fluid ounces, not dry ounces. A fluid ounce is a measure of volume, just like a liter is.A dry ounce is a measure of weight. The weight of one liter of a substance depends on its density. liter = 1000 ml. One 12 ounce can of pop contains 355 ml, so three 12 ounce cans of pop would be 1 liter plus 60 ml. Please note that liter is spelled litre in the U.K.