Made with double-walled construction and high quality 18/8, food-grade stainless steel, the vacuum between the bottle walls offers superior insulating properties * Lightweight and perfectly sized to fit in most cup holders and the leakproof Loop Cap clips onto just about anything * Free of BPA, phthalates, lead and other toxins, stainless steel caps create a 100-Percent stainless interior * Can be used with the Klean Kanteen Flip D-Ring Cap and the new Café Cap * Great for home, office, travel or even backcountry-works with standard water filter accessories