500 ml (17 fl. oz) bottle features double-walled, 18/8 stainless-steel construction with a heat-reflecting copper layer Vacuum insulation keeps drinks hot for up to 12 hours and cold for up to 24 hours Lid stores neatly on neck of bottle 340 ml (12 fl. oz) cup features double-walled, vacuum insulated stainless steel that remains cool to the touch Flip-top cap completely covers mouthpiece for better hygiene