2) Whole bean coffee is best bought in the special foil-lined bags with one-way breather valves. Coffee beans continue to react for a time after roasting, and even when vacuum packed the CO2 is produced by the beans will relieve the pressure difference, which can makes the bag softer again. This doesn't mean that the bag has lost its seal. These will keep the beans reasonable for at least a year. They will degrade in flavor after that, and when they can no longer be tolerated is somewhat subjective, but for me, that's the limit of how much coffee I can store and rotate. I can keep other extra coffee around, for the ultimate SHTF, when I will be happy to drink anything, but eventually it will be thrown away if the SDHTF.
I've also read that coffee continues to give off CO2 for quite a few months after roasting. How, then does a vacuum packed can of coffee not start bulging after a few months if it is canned soon after roasting and grinding? I would think that the grinding, also, would increase the surface area and accelerate the release of CO2. I am wondering if the answer is they are canning stale coffee to begin with. Folgers tastes like it.
Just a thought.
BTW this is my first post on Realcent forums, just got my account cleared. Enjoying the info and hope to start putting it to use. Started "collecting" copper pennies a few weeks ago, hand sorting. My kids love it.
tex