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Originally Posted by Wormius
I don't under why whole bean coffee doesn't come in resealable bags. They have resealable bags for virtually everything under the sun, but coffee? No, it's either nothing or some lame twist tie thats part of the bag, but doesn't keep the bag sealed. Usually I just end using a giant bag clip, but I just don't get why the coffee industry hasn't caught on.
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It has to do with coffee beans releasing gasses that could potentially pop a bag, that's why most decent coffees come with that valve thing on there to let pressure out.
Plus wikipedia says this:
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In addition, for the first week of storage, containers should be opened to vent out the carbon dioxide gas that will be produced by the roasted beans to prevent the gas from changing the quality of the coffee.[3] Whole bean roasted coffee stored in this manner will last for about two weeks.
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So I guess the "non-sealed" bag is best for home use? Having said that, our office coffee supplier delivers everything in ziplock type bags, and given that most people are opening/closing the bag daily there's probably not much risk of the pressure causing much of anything.