A sealing cap for releasably closing a container has a cap body matching the container to be sealed, a closing mechanism, which releasably seals the container and the cap body and a seal co-operating with an upper edge of the container in order to seal it when the closing mechanism is operated. In addition, the closing cap has at least one shoulder formed on the cap body which faces the upper edge of the container and with which the seal co-operates when the closing mechanism is actuated.
