Stay hydrated on the trail with the Hydro Flask® 40 oz. Wide Mouth Bottle. This stainless steel, powder coated water bottle features a wide mouth, perfect for smoothies or adding drink mixes. The double wall vacuum insulation keeps hot beverages hot for up to six hours and cold beverages cold for up to 24 hours. The Hydro Flask 40 oz. Wide Mouth Bottle will quench your thirst when you need it.