Zanussi 1l stainless steel vacuum flask the zanussi 1l stainless steel vacuum flask has been crafted with a double walled vacuum insulation that is ideal for helping to keep drinks warm or cold for hours this zanussi flask also features a one touch stopper that allows for poring without having to remove the stopper completed with the zanussi branding to the base flask soft touch stainless steel 188 stainless steel double walled vacuum insulation keeps drinks hotcold