A container for liquids equipped with delivering plug comprises: a main body placed at the delivery end of the container, a lower closing piston inside the main body, from the side oriented towards inside the container, and an upper cover with collapsible membrane/push-button placed inside the main body, from the side oriented towards outside the container; the upper cover with collapsible membrane/push-button fastened to the main body comprises a central push-button equipped with internal weakening points, to allow deforming the central push-button passing from a closing position to a stable using/opening position.