Coffee packaging contains the product while limiting exposure to air, moisture and light. For roasted coffee, it also has to account for gas released after roasting. The source contrasts valve-equipped bags with other sealed formats, drawing attention to how a package functions rather than just its appearance.
A one-way valve can allow gas to escape from suitable packaging. That feature does not tell you everything about seal integrity or how the coffee was handled before packing. Look for a clear product identity, a relevant roast or production date and an amount appropriate to your usage.
Individually packaged pods offer a different balance: portion control and convenience in exchange for more packaging and a particular brewing format. Compare the cost and waste of the consumable you will actually buy. Once a bag is opened, close and store it deliberately instead of assuming that its original packaging technology continues to solve every freshness problem. The best package is one part of a sensible supply and brewing routine.
The conversation
A good question can make a better brew.