OtterBox have been tested to 100 feet and should not leak if cared for and used properly. First, make sure that your seal is completely clean. Use a Q-tip to remove any dirt or debris from the seal surface. Second, make certain that the objects you are placing in the case are not too big for the box and therefore pushing the box lid open which would compromise the sealing qualities of the box. If problem persists, contact customerservice@otterbox.com for further diagnosis.