Hydration Thermos Hydro Flask Wide Mouth Thermo 945ml Blue. Stay hydrated all day with the HYDRO FLASK Wide Mouth Thermo 945ml Cascade. This durable, high-quality thermos is perfect for keeping your beverages cold or hot for hours on end. With its wide mouth opening, it's easy to fill and clean, while the double-wall vacuum insulation ensures that your drinks stay at the perfect temperature all day long. The Cascade design adds a touch of style to this functional hydration solution, making it perfect for on-the-go use or daily use at home or work. Say goodbye to lukewarm drinks and hello to refreshing hydration with the HYDRO FLASK Wide Mouth Thermo 945ml Cascade.