I'm interested in trying some of the beans sold online here, particularly curious about the Lavazza Super Crema for espresso. But I have a more basic question regarding freshness/shelf life of beans. Many of the articles I've read suggest buying as freshly roasted beans as you can find. So I've been trying to hit my local roasters as soon after their weekly batches are available. So when I see Lavazza sold in 2.2lb bags, and people buying cases do them, I wonder about the freshness. Does their airtight packaging prolong freshness? And how long after opening a 2.2lb do the beans remain fresh (assuming airtight storage in a cool pantry)? Thanks!