Nalgene Tritan OTF

The On-The-Fly (OTF) Bottle is designed with a loop-top that swings open wide to reveal a contoured, high-flow drinking spout that’s easy to fill at the fountain or sink. The On-The-Fly (OTF) Bottle is designed with a loop-top that swings open wide to reveal a contoured, high-flow drinking spout that’s easy to fill at the fountain or sink. One handed push putton for easy opening and closing Locking bail for ultimate insurance against leaks; Silicone stopper seals off the drinking spout Lid stays out of the way while drinking Molded-in measuring marks