A double-walled vacuum sealed stainless steel 650ml water bottle. Made with 18/8 stainless steel – the highest quality steel used for food preparation, providing the water bottle with a lifetime of durability. This eliminates the need for plastic and glass, making the flask the ultimate eco-friendly water bottle to ditch disposable and take the necessary step towards a sustainable future. The double-walled vacuum feature has been designed to keep your chilled drinks cold for up to 18 hrs and your dose of caffeine hot for up to 8 hrs.