Ideal for broth, soup or salad, this large-capacity flask is made of durable stainless steel, including the lid which doubles as a cup. It remains cool to the touch when filled with hot liquid or food and doesn't drip when filled with chilled drinks. Thermos® vacuum insulation technology keeps the contents hot for up to 14 hours or cold for 24 hours. For safety and hygiene please ensure that your Thermos product is cleaned with warm water and washing-up liquid prior to initial use. For best results from your product, before use, pre-fill for about three minutes, using either hot water for hot food or cold water for chilled food. Never use a microwave or conventional oven to pre-heat your product. If your product has not been used for some time, rinse with warm water to remove any residual odours. Do not immerse in water. Store with the stopper off. For difficult stains put a teaspoon of bicarbonate of soda in hot water with the stopper off. Can be soaked overnight. DO NOT overfill your product. Leave sufficient space in the neck to fit the stopper. After filling, always ensure that both the outside cup and stopper are tightly closed.