Quote:
Originally Posted by Undertoad
Coffee is a unique product, with unique packaging needs. After the beans are roasted, they need to be vacuum packed right away for freshness, but they also "outgas" for a while. So they need a flexible vacuum package with a completely airtight seal, and a little valve that lets air out, but not in.
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I did not know that! I've always wondered why there was so much room in a coffee bag.