Fits snugly into the neck of a Nalgene bottle to provide a nice controlled flow when you sip Helps prevent spills and splashes while you drink from the large bottle size Designed to fit the 30 oz wide mouth Nalgene bottle size Easy to pop in or out for cleaning, or refilling the bottle Dishwasher safe - 2 Count Nalgene's best-selling water bottle for over 20 years. Nalgene Easy Sipper Splash Wide Mouth Plastic Water Bottle Cup, 32oz Made of Tritan co-polyester without bisphenol A, with excellent impact resistance; suitable for the top rack of the dishwasher. Suitable for both hot and cold drinks. The wide mouth makes it easy to clean and add ice cubes. Opening fits most water filters. Marked with milliliters and ounces for easy measurement.