Freshly roasted coffee releases CO2 for days. How a one-way degassing valve lets it out without letting oxygen in, and where to place it on a bag.

Oxygen, moisture, light and aroma barriers explained, with common film structures and how to choose the right one for your product's shelf life.

How long granola lasts and what decides it. Identical granola ran 33 to 271 days depending only on the film. Barrier targets, the crispness cliff, and what to specify.