Hydration Thermos Hydro Flask Wide Mouth Thermo 710ml Pink. The HYDRO FLASK Wide Mouth Thermo 710ml in Trillium is a stylish and durable hydration solution for those on the go. This thermos is designed with a wide mouth opening, making it easy to fill, pour, and clean. The double-wall vacuum insulation keeps beverages hot for up to 6 hours or cold for up to 24 hours, ensuring that your drink stays at the perfect temperature all day long. The 710ml capacity is perfect for staying hydrated throughout the day, whether you're at work, school, or out on an adventure. The Trillium color scheme adds a pop of color to your hydration routine, making it a fashionable accessory as well as a functional one. Stay hydrated in style with the HYDRO FLASK Wide Mouth Thermo 710ml in Trillium.