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Here’s What The Valve On Your Bag Of Coffee Actually Does

From: msn.com

If you’ve ever perused bags of coffee at the grocery store or while waiting in line at the coffee shop, you might have noticed that most of them have a small hole or a plastic valve near the top of the bag. What you might not realize, is the valve actually plays an important role in keeping your coffee fresh and tasting great as it sits on the shelf. Once you know what it’s for, you can even use it to help determine how fresh the coffee is that you picked up.

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