AmaMaji Double Walled, Stainless Steel Water Bottle with Patent Pending Octalid design technology. SIMPLE, ELEGANT, AND TOUGH BOTTLE WITH A HUMAN SIDE! SHIELDED DESIGN TECHNOLOGY: Double walled design keeping cold drinks cold for 24 hours and hot drinks hot for 12 hours OCTALID 8-SIDED LID: 8-sided lid for easy gripping and takes less than one revolution to open. Lid sits securely on lid when tightened. BPA FREE 18/8 FOOD GRADE STEEL: Free from harmful BPA, contents do not get metal taste. NO LEACHING! HUMAN IMPACT: Each purchase brings clean water to those in need.