Big on size and even bigger on performance, this 40oz. mug is built for serious sipping. With double-wall food-grade stainless steel, it keeps drinks cold for 36 hours or hot for over 2.5 hours. The large handle makes it easy to carry, while the leak-resistant slide-lock lid and straw add convenience. Named an ASI Editor's Pick for a reason, it's hydration made simple - packaged in a retail-ready gift box.