For those who prefer a roomy bottle with a smaller opening, Nalgene offers the narrow-mouth loop-top bottle. It has all the same advantages of the wide-mouth, along with a top that minimizes the chance of spills and a cap that never gets lost. Printed graduations simplify the process of measuring and keeping track of hydration. This bottle is made from Eastman Tritan co-polyester. Extremely durable and manufactured without Bisphenol A (BPA). Resistant to staining and retaining odors. Dishwasher Safe - Please make sure the cap does not touch the heating element. Withstands temperatures from -40ºF to 212ºF. This bottle has a recycling code of #7, which means other. It does not contain BPA Made in USA