The Aarke Steel Bottle Carbonator Pro 500 ml is a premium reusable stainless-steel bottle designed for direct carbonation in Aarke machines. With a total capacity of 500 ml, it features a marked 400 ml filling line for precise carbonation. Its innovative double-wall vacuum insulation ensures your drinks remain cold and carbonated for up to 24 hours, allowing you to easily carbonate water at home and carry it without the need for additional containers. Crafted from over 90% recycled stainless steel, this bottle is both environmentally friendly and stylish, making it a perfect choice for eco-conscious consumers.