This is the bottle that put Nalgene on the map. And after all these years it is still a best seller. Its design appears simple but there are over fifty years of manufacturing experience that go into creating a super durable, leak-proof bottle that is guaranteed for life. Made of Eastman Tritan copolyester and is free. Graduations help you keep track of your fluid intake. Dishwasher safe top rack only - Just make sure the cap does not touch the heating element. Superior impact. Suitable for both warm and cold beverages. A convenient loop-top design means you'll never lose the lid. A wide mouth makes adding ice cubes a snap. Opening accommodates most water filters. Marked with milliliters and ounces for easy measurement. Made in the USA. to staining.