This void will certainly assist protect against any type of fluid from dripping out. Likewise make certain not to fill it too promptly or you can run the risk of flooding the container. Put a lid on it-- If you leave a container without the leading cap, it will leak out of the airflow openings. See to it that your storage tank is vacant if you intend on leaving your top cap off for prolonged periods of time-- anything longer than it requires to fill it.