We bought this to move our son to college with the intent to only use it for his bedding to free up space in our car. We wrapped everything in plastic bags beforehand. After a rain shower on our trip, we arrived with wet belongings ruining a foam mattress topper and had to go buy another. We had looked at less expensive waterproof options but went with the Thule brand name instead. Now, I'll have to go buy another cargo carrier to bring him home because you cannot depend on it not raining. However, it did stay secure to our roof rails even with the pooling water in the bottom of our bag.
Grand Rapids, MI