Eco-Friendly Bamboo Flask with Smart Temperature Display – Stay Hydrated in Style This is an eco-friendly drinkware product suitable for the most environmentally aware consumer who wants to stay fashionable, functional, as well as safeguard the environment. Drink piping hot tea or icy water—the temperature remains precisely at what you want it to be. Made from natural material, the bamboo outer provides a smooth, eco-friendly finish, while the double-walled insulation ensures maximum performance. The stainless steel interior retains temperatures effectively.