In general, dry bags can last for many years if they are properly cared for and stored correctly. The lifespan of a dry bag depends on various factors such as the material used, how often it is used, and how it is maintained. High-quality dry bags made from durable materials such as PVC or nylon fabrics can last for a long time, even with frequent use. Regular maintenance, such as cleaning, storing in a cool, dry place, and avoiding harsh chemicals and sharp objects, can help extend the life of a dry bag.