Daniel Norris

I'm Daniel Norris, a reluctant coffee snob. After 16 years in Australia, I'm back in Hawaii on the Big Island, pulling espresso at home on a Gaggia Classic Pro and logging my shots in Dialed Shots, the app I built for it. You can see exactly what I use in my espresso setup guide, my coffee setup guide and my travel coffee setup.
Bags of fresh roasted coffee lined up on a cafe counter
Coffee6 min read

What that Coffee Bag Valve Actually Does (and How to Check It at Home)

That little round coffee bag valve lets CO2 out without letting air in. Here's what it does, how to check it at home, and what to do once the bag is open.

Daniel NorrisNov 6, 2026

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