Typically, a bottle that is simply re-corked and placed into the refrigerator will be food for about 3-5 days before it starts to turn to vinegar. Most of the time, the bottle just doesn’t have that same crisp and inviting flavor on the second day as it does on the first. These devices are made to ensure that you will be able to open a bottle without the need of inviting friends over to help you finish it before the night is over. These devices are made so that it will preserve the bottle to the best of its ability as long as possible. Some users feel that these devices can keep a bottle fresh up to 15 days.