Hydration Thermos Hydro Flask Standard Mouth Thermo 620ml Green. The HYDRO FLASK Standard Mouth Thermo in Fir is a stylish and durable hydration container designed for on-the-go use. With a generous capacity of 620ml, this thermos is perfect for keeping your favorite beverages at the ideal temperature throughout the day. The standard mouth of the thermos makes it easy to drink from, while the double-wall vacuum insulation ensures that your drinks stay hot or cold for hours on end. The sleek and rugged design of the HYDRO FLASK Standard Mouth Thermo in Fir makes it a great choice for outdoor adventures, workouts, or simply staying hydrated on the go. Stay hydrated and keep your drinks at the perfect temperature with this reliable and high-quality thermos.