What’s That Hole On My Coffee Bag?

If you've ever purchased a bag of specialty grade coffee, you might notice a small pin hole located somewhere your bag. Occasionally when people grab a bag of coffee, they'll squeeze the bag with their nose near it to get a whiff of the goods inside. Believe it or not, that's not just a "smelling hole" as I've heard it referred to before. It's actually a one-way valve & it's critical to the shelf life of the coffee and the preservation of the bag itself. When coffee is fresh roasted, it releases...
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