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Coffee bags are specialized packaging bags used for storing coffee beans or ground coffee. Here are some key characteristics of coffee bags:

1. Oxygen barrier: Coffee bags are typically made from multi-layered composite materials that provide excellent oxygen barrier properties. This helps to preserve the freshness and flavor of the coffee by preventing oxygen from entering the bag.

2. Moisture resistance: Coffee bags have good moisture resistance, preventing moisture from seeping into the bag and causing the coffee to spoil or lose its quality.

3. Barrier properties: Coffee bags are designed with high barrier materials that effectively block out oxygen, moisture, and odors from the surrounding environment, protecting the quality and aroma of the coffee.

4. Sealability: Coffee bags are equipped with reliable sealing systems such as ziplock seals, heat seals, or adhesive tape closures. This ensures a tight seal to prevent any leakage or exposure to air, keeping the coffee fresh and aromatic.

5. Resealable feature: Some coffee bags come with resealable functionality, allowing consumers to open and close the packaging multiple times, maintaining the freshness of the coffee and providing convenience for storage.

6. Light protection: Coffee bags may incorporate light-blocking materials or coatings to protect the coffee from harmful UV rays, which can degrade the quality and flavor of the coffee.

7. Design options: Coffee bags come in various sizes, shapes, and designs to cater to different packaging needs and provide branding opportunities for coffee companies.

It's important to note that coffee bags should be stored in a cool, dry place away from direct sunlight to ensure optimal preservation of the coffee's flavor and aroma.