The valve on the coffee package serves to release carbon dioxide while protecting the coffee from oxygen exposure. In the first few days after roasting, coffee releases several liters of carbon dioxide, which, if left in contact with oxygen, can cause the coffee to lose its freshness. If there is no valve on the package, it means the coffee has been degassing for some time and has likely lost up to half of its flavor and aroma. To prevent this, we package our coffee immediately after roasting and always use packages with valves, which allows us to preserve the taste and aroma for much longer.