1 liter = 33.8 ounces Custom designed EarthLust bottles are made from high quality #304 food grade stainless steel, which is naturally safe unlined. Made with non-toxic paints and BPA-free safe polypropelene #5 caps. Each bottle comes with a high quality carabineer and optional sports tops are available for the 13 and 20 ounce sizes. Every bottle helps to eliminate waste and gives you a safe and stylish way to have a cold beverage near you at all times! No need to worry about Bisphenol-A, Phthalates or PVC with our bottles! Bottles are ethically made in China and designed and tested in California. We are in strict compliance with Prop 65 and meet the requirements for the American Society of Testing Materials (ASTM) and European Standard on Safety of Toys (EN71). It is recommended to use baking soda or diluted white vinegar wash to preserve the clean, neutral taste over time (brush as needed).