Bananas make a wonderful nutritious snack, but when bought in a bunch they can ripen too quickly. This is because bananas contain an enzyme that causes them to ripen at room temperature. They can also cause other fruit in the same bowl to ripen too quickly. The special material of our Banana Storage Sack will keep your bananas at the right temperature ensuring they don't ripen too quickly. In fact, they will last twice as long. We recommend that you keep this banana storage bag in the fridge for optimum results.