Hot water bag Size:  1750ml Material: Rubber About the Product There’s nothing like an old fashioned hot water bottle to keep you warm at night. It provides soothing comfort with no cords attached. Made from natural rubber, the flexible bottle conforms to your body; contains latex. Soothe aches and pains by filling the bottle with warm or cold water and placing on the affected area for 10 to 15 minutes per hour.