Once exposed to the air, ground coffee quickly loses its flavour and aroma. The vacuum pump simply extracts the air from the vacuum coffee saver creating a vacuum, so that flavour and aroma of the coffee will be kept in perfect condition.This vacuum food containers set offers unparalleled versatility in your kitchen, providing vacuum sealed containers for food storage as well as instant marinating. Whether it's meat, fish, poultry, or vegetables, achieve exceptional tenderness and flavor in just minutes