The Nalgene N-Gen Water Bottle 750ml is a great way to keep yourself well-hydrated through all your adventures! It has a 2.08 (53 mm) opening that makes it easy for adding ice for a cold beverage of choice. This bottle is BPA, BPS and Phthalate free made from Tritan material that leaves no after-taste or intake of any leaching toxin, while you enjoy your refreshment. Plus, it's semi-translucent so you can see if the inside is clean and know how much water you have before you reach your next refilling station. This Nalgene water bottle weighs just under 5.6 oz. (159g) when empty, is convenient and portable as well. Thanks to a slim and graduated profile, it doesn't slip out of your hands either. Use the handy loop to clip it easily to your backpack while you travel. The capacity of this bottle is 24 fl.oz. (approx. 750 ml). Adventures are now more fun with the Nalgene N-Gen Water Bottle! The N-Gen bottles are made in USA. Nalgene N-Gen Water Bottle 750ml 2.08 (53 mm) Opening Easy Adding Ice for Cold Beverage of Choice Made from Eastman Tritan Co-Polyester BPA, BPS and Phthalate Free Nontoxic Leaves No After-Taste Semi-Translucent Easy to See Content Weighs Just Under 5.6 oz. (159g) when Empty for Easy Transport Slim & Graduated Profile, Won't Slip Out-of-Your-Hands Handy Loop to Clip Easily to Backpack while Traveling Capacity: 24 fl. oz. (750 ml)