This is the bottle that put Nalgene on the map. And after all these years it is still our 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. Graduations help you keep track of your fluid intake or serve as a useful guideline when mixing up a beverage in your Nalgene. Most backpacks have a pocket on the side to hold a bottle and those pockets were designed to accommodate a Nalgene bottle because hikers have trusted Nalgene for over twenty years. Features Our Everyday line is made of Eastman Tritan polyester, and is BPA Free Dishwasher safe (top rack only) Just make sure the cap does not touch the heating element Everyday bottles have superior impact resistance and are suitable for both warm and cold beverages Convenient loop-top design means you'll never lose the lid Wide Mouth makes adding ice cubes a snap Opening accommodates most water filters Marked with millilitres and ounces for easy measurement Made in USA All plastic bottles and containers are not alike. Nalgene gives you that extra measure of security not available with other containers. Made with super-tough materials, Nalgene closures have no liner that can wear, crease, leak or cause contamination. The container walls are generally thicker and more split and puncture-resistant than lower quality bottles. Guaranteed leak-proof, they consistently keep your contents fresh and provide added protection against leakage and breakage.