Iron Flask Bottle with Spout Lid, Blue Waves, 128oz/3800ml. Whoever said “bigger isn’t always better” obviously never got their hands on an Iron Flask One-Gallon Water Bottle. This titan of thirst quenching holds a whopping 128 oz of your favorite beverage in a vacuum-insulated, rough-and-tumble container that can stand up to any adventure. And with a huge array of colors, it’s easy to match your bottle to your personal brand. With the Iron Flask 128 oz water bottle, the only thing you need to worry about is how close you are to a bathroom.