When coffee is fresh roasted, it releases carbon dioxide. It's basically a by-product of the roasting process. ... That valve on your bag allows for the carbon dioxide to escape from inside the bag without allowing oxygen to enter the sealed bag.Aug 19, 2014
How do you read a coffee bag?
- Name. Most specialty coffee roasters name their coffees after the farm, cooperative, or region where the coffee was produced. ...
- Region. Coffee, like wine, is a terroir-expressive beverage. ...
- Process. ...
- Variety. ...
- Elevation. ...
- Roast Date. ...
- Tasting Notes.
Why would you want coffee bags?
Convenience. There's no doubt that coffee bags are massively convenient. They're just as easy to carry around as the small, individual sachets of instant coffee. This means that they're excellent for trips away, camping, or just for taking to work.