
After roasting, beans produce more than three times their volume in carbon dioxide, thus making packaging in cans or other solid containers impractical...unless you let it fully de-gas for several days or weeks before packaging...in which case it cannot be truly fresh! This problem was solved more than 30 years ago, when the one-way valve was invented. This valve can be laminated into an oxygen-impermeable material, so that carbon dioxide could be released without allowing oxygen to reach the coffee and destroy its virtues. This extends the life of roasted coffee beans and allows for immediate shipping. The best cup of coffee results from grinding and brewing beans as soon as possible after the 24-48 hours of degassing which occurs after roasting.
We bag our coffee by hand in this type of packaging immediately after roasting to minimize contact with oxygen. Ask your favorite coffee shop or mail-order supplier about how they preserve the freshness of their product! You may be surprised by the answers...