Klean Kanteen Wide Insulated Stainless Steel Bottle with Loop Cap (20-Ounce) 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 Caf Cap Great for home, office, travel or even backcountry-works with standard water filter accessories