Moisture is a major enemy when it comes to storing food, especially blueberries. Moisture is the biggest obstacle that needs to be overcome in order to ensure that your blueberries remain fresh and tasty long after harvest. The key is controlling the humidity, which is why using paper towels for storage can do wonders. Layering your berries with paper towels between each level not only serves as an extra buffer against moisture but also keeps the berries apart - essential for avoiding moldy build-up if any of them happen to find damp conditions.