title_body: Is there any way to preserve roasted coffee beans?
upvoted_answer: Coffee beans, once roasted, are perishable; they don't "keep". Within roughly five days of roasting staleness is detectable (taste/quality is adversely affected). There is one way to preserve freshness: consume freshly roasted beans within roughly a week. Don't freeze; beans absorb moisture and lose flavour— ick. Vacuum packs aren't the answer, either. To remove all gases from packaging would require a system using pressure, 29" Hg, that no one, not even coffee giants, can afford. The best practice is to just buy beans (roasted on the day you purchase, ideally) in quantities you'll use within a week to 10 days.