Maintain your zippers' longevity by keeping them clean, free of sand and grit, and out of the dirt as much as possible. Most zippers fail due to wear and tear to the coating on the inside of the zipper slider (the metal toggle on your zipper). Once the coating wears off, the metal abrades rapidly, and the zipper slider no longer joins the plastic coils securely. This causes the coils to separate from the slider. Hand wash your pack frequently to remove dirt and grime, and preserve the coating on your metal zipper slider. Moving parts will wear out over time. This is often the result of natural break down.