Valve bags are air tight coffee bags with small one-way valves that allow gases escape but do not allow air into the bag. The valve bag was a significant development for the specialty coffee industry since it allowed coffee roasters to package freshly roasted coffee without first degassing the coffee beans. Shortly after roasting, coffee beans give off a tremendous amount of gas, which will expand sealed packages not equipped with a one-way valve. If packaged immediately in valve bag, freshly roasted coffee will produce enough gas to expel most of the oxygen from the bag, thereby allowing the beans to stay fresh much longer.
Storing coffee beans: If you grind your fresh roasted beans within a week or two, an airtight container in a cool dark place is ideal. If you have a large quantity of fresh coffee in unopened foil valve bags, the entire air-tight valve bags can be stored in a freezer to retain freshness for months. For best results, thaw before opening to prevent water from condensing on the beans. Refreezing coffee beans is not recommended.« Back to Glossary Index