The Nalgene Sustain Narrow-Mouth 32-oz. Water Bottle is part of a sustainable, eco-friendly line of products with the durable long-lasting quality you expect from Nalgene. This bottle's high-performance, leakproof Tritan Renew construction, made from 50% waste plastic (using ISCC-certified mass balance), is built to last and BPA- and BPS-free. The attached lid means no O-ring or worrying about losing it. Dishwasher safe. Leakproof Tritan Renew construction a new material derived from 50% waste plastic (using ISCC-certified mass balance) Built to last and dishwasher safe BPS- and BPA-free Worry-free attached lid Durable, lightweight construction