Abstract: A refillable closed container that cannot be refilled without the use of a special mechanism. The refillable closed container system comprises a valve body secured in an opening of the container, a flow passage through the valve body for permitting flow into and out of the container, a magnetically attractable valve member in the valve body, and a magnet carrier. The valve member is movable between a closed position for blocking flow through the passage and an open position for permitting flow through the passage. The magnet carrier carries a magnet for magnetically moving the valve member toward an open position when the magnet carrier is secured to the container to permit refilling of the container.