How Packaging Choices Affect Coffee From Roast to Cup
After being roasted, coffee’s best protection is its packaging. Even the best quality beans in the world can lose some of their flavour, if they are stored in conditions that allow air and light to get in. The quality of the coffee is directly related to the quality of the packaging; it’s not simply a marketing decision.
When coffee is roasted, it gives off gases. This is why there must be a balance between protecting the coffee from air and light, while also allowing for the gases to escape. If there are no materials that allow for gas to properly escape, bags can trap oxygen and retain it; but if the gases are not able to escape from the bag, they can create problems in how the coffee actually tastes.
Traditional storage options have difficulty finding a balance between protecting the coffee and allowing for adequate ventilation. Many of the traditional options (thin bags, paper packaging, and generic storage containers) tend to skew the balance toward convenience rather than preservation; as a result, the trade off of this imbalance will eventually show itself in the cup of coffee that you brew.
High barrier packaging (e.g., Mylar) is designed to take the place of the traditional packaging and handle the issues that arise from inadequate protection. High barrier packaging keeps coffee fresh longer (closer to its original flavour) due to its ability to limit the exposure to oxygen and light, which slows down the natural ageing of coffee; this benefit is especially important for whole bean coffee.
When packaging performs its intended role quietly in the background, consumers will experience the flavour of their coffee closer to its intended flavour profile for a longer period of time, regardless of whether or not the coffee is used right away.
This article about Mylar bags for coffee storage will help to answer how the various types of packaging (materials) will perform in terms of keeping coffee fresh, how to compare various types of materials used for coffee storage, and approximately how long coffee can be kept fresh, if properly and appropriately stored.

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