The food flask is a multipurpose flask made up of stainless steel double wall. It is ideal for hot and cold usage for school, office, home and travel. It's also suitable for storage of food, beverages, hot or cold and outdoor activities like camping, hiking, etc, Good Quality, Unbreakable Stainless Steel Liner And Outer Shell and Superior Insulation Performance-patented Vacuum Technology and Double Wall The food flask is a multipurpose flask made up of stainless steel double wall.