Abstract: A storage accessory that enables containers to be sealed at a desired level above the remaining contents. In an embodiment, the sealing device for a container comprises a device body having a chamber with an opening in the bottom end of the device body. The bottom end of the device body adapted to be inserted into a container, such as a wine bottle. A deployment member within the chamber, which may traverse the device body, is configured to be able to deploy arms that bias a flexible barrier outward to engage the container. In an embodiment, the arms are formed from resilient metal wires made of superelastic shape memory alloy, such as NiTi. When in a retracted position, the resilient wires may fit into the chamber of the device body. When in an expanded position, the resilient wires bias the flexible barrier causing the flexible barrier to seal a container.