Nalgene's leak-proof loop-top swings open wide to reveal a contoured, high-flow drinking spout that's easy to fill at the fountain or sink. One-handed push button for easy open/close; locking bail for ultimate insurance against leaks. This Nalgene water bottle is completely leak proof, made of virtually indestructible BPA-free Tritan, easy to clean and dishwasher safe on the top rack. Suitable for both warm and cold beverages (-40 to 212 degrees Fahrenheit); wide mouth makes cleaning and adding ice cubes easy. Free of BPA, BPS and phthalates, opening accommodates most water filters; marked with milliliters and ounces for easy measurement. Whether you're looking for a virtually indestructible water bottle for a backcountry adventure, or you want a clean, green way of storing your dry pasta, you'll find a Nalgene product that gets the job done.