Stainless Steel Vacuum Flask Hot and Cold Water Bottle - 500mlA vacuum flask water bottle is a container made of stainless steel with double walled construction, designed to keep liquids hot or cold for an extended period. This type of water bottle is typically used for outdoor activities, commuting, travel or everyday use. The flask has a capacity of 500ml and features a vacuum insulated double walled construction, which helps maintain the temperature of the liquid inside the bottle. The double walled design