Brainteaser - Measuring Wine

You're at a vineyard and are given two empty wine bottles: one with a capacity of 3 liters and another with a capacity of 5 liters. There are no markings on the bottles except for their total volume. You have access to an unlimited supply of a rare vintage wine from a barrel. Your goal is to get exactly 4 liters of wine. How can you achieve this using only the two wine bottles?