How long can this bottle keep beverages hot or cold? VACBOTT double-walled insulation, the bottle can keep beverages hot and cold for up to 24 hours. What materials are used in the construction of this bottle? VACBOTT bottle is made from high-quality stainless steel SS304 Inside & Outside, which is durable and resistant to rust and corrosion. Is this bottle made in India? Yes, this bottle is proudly made in India. Is this bottle BIS certified? Yes, this bottle is BIS certified, meaning it meets high standards of quality and safety. Can the bottle be used for both hot and cold beverages without any issues? Yes, the double-walled insulation is versatile, effectively maintaining the temperature of both hot and cold drinks.