Made with double-walled construction and high quality 18/8, food-grade stainless steel, the vacuum between the bottle walls offers superior insulating propertiesnLightweight and perfectly sized to fit in most cup holders and the leakproof Loop Cap clips onto just about anythingnFree of BPA, phthalates, lead and other toxins, stainless steel caps create a 100-Percent stainless interiornCan be used with the Klean Kanteen Flip D-Ring Cap and the new Café CapnGreat for home, office, travel or even backcountry-works with standard water filter accessoriesnKlean Kanteen Vacuum Insulated Stainless Steel Sports Bottle. Portable, reusable and recyclable. Large 1.75" opening for easy filling and pouring.