... at least 24hour... 4.Capacity:350ml-500ml Features1.Material:double wall construction,18/0 or 18/8 stainless steel is available ... production of stainless steel vacuum insulation cups, thermos bottles, sports pots, office cups, sports cups, vacuum cups, coffee pots, auto glasses and ... to contact us for further information. Contact To Us! Double wall elegant stainless steel vacuum flask,travel bottle