hi guys, your zega topcase is not waterproof at all. first run with the case in the rain let sand and water in the topcase through the bottom. I could not remove the topbox from the rack to due to sand in the internal mechanism. the water comes in all around the bottom plate as well as screws that attach the mechanism. I took everything apart cleaned it and then re installed adding silicon around the whole bottom plate and in the screw holes as well. not to pleased that I had to be the one to fix this as the price of these would warrant a better thought out product.