title_body: Are reused glass jars ever fit for storing ground coffee?
upvoted_answer: The Short answer  to this is no. You should not use a glass jar for storing coffee. 
  
  Why? The base of the answer can be found here: When Does Coffee Go Off?
  
  Coffee goes stale relatively quickly, and the transfer to a glass jar will: 
  
  
  Increase the coffee's interaction and exposure to oxygen 
  Increase the coffee's exposure to light, which will cause rancidification of the oils
  
  
  Furthermore, you should only be purchasing and storing whole bean coffee - as pre-ground coffee is already stale.