Designed to keep beverages cold for 24 hours and hot for 12, our water bottles feature double wall construction with an extra interior copper layer for superior performance., Our bottles are made from premium grade, 18/8 stainless steel that’s non-toxic, non-leaching and BPA free, 17oz bottle is perfectly sized to keep you hydrated all day long, from your morning commute, to meetings, to yoga class to work Vacuum insulated to keep liquids and carbonated beverages fresh, Hamster London bottles are backed by our one-year Satisfaction Guarantee