title_body: Is there a way to economically store freshly roasted coffee under vacuum?
upvoted_answer: Yes, there is a way to store freshly roasted coffee - or even store bought roasted beans - at home under vacuum without expensive equipment.  I drink wine and have collected a couple of wine storage devices over the years that I no longer use.  One of these is a bottle stopper with a one-way valve in the top and a vacuum pump for removing the air from a partially consumed bottle of wine.  
  
  My idea was to clean out the bottle and fill it with freshly roasted coffee beans, then use the vacuum pump and stopper to apply suction to the bottle to encourage the carbon dioxide to exit the beans without worrying about oxygen making the beans go stale prematurely.
  
  I've found that the beans emit enough carbon dioxide gas to require re-pumping the bottle for the first day or two, but after that it will hold a vacuum indefinitely.  I've added erasable labels to the bottle to record the type of roasted beans I have inside.  Two standard wine bottles will hold about 610 grams of roasted beans, or about 700 grams of unroasted beans, which is 7 batches in my SR 500 roaster.  These are Ethiopian, YMMV.