... cold for long tim Vacuum stainlesss steel bullet type flask, flask, thermos Key Features: a.Designed for the future; ... b.High Quality Steel; c.Vacuum insulated thermos flask; d.Unbreakable lid under right usage; e.One ... ,bleach or cleansers containing chlorine to clean the flask;d.When not in use,keep your pot ... Double wall stainless steel bullet type vacuum flask, any color painted is ok