Nalgene Tritan Narrow Mouth BPA-Free Water Bottle Narrow-mouth, BPA-free water bottle made of Eastman Tritan polycarbonate Narrow loop top minimizes the chance of spills and never gets lost BPA-free construction is impact-, odor-, and stain-resistant, Withstands temperatures between -40 and 212 degrees F Available in 16- and 32-ounce sizes in wide variety of colors