The Tritan OTG's lid swivels vertically on a hinge built into its loop cap, and those who like to drink to fast will appreciate the quarter-sized opening, which makes quenching your thirst a hasty affair. The inside top of the cap has a soft seal that presses firmly against this gaping maw when the lid is closed, making the bottle leak-proof. Unfortunately the plastic catch this lid uses lacks the satisfying snap a bottle this bulky demands, and users will find themselves fiddling with it a bit to make sure the cap on the opening is closed tight. That said, this bottle's design impressed all of our testers; the Everyday Tritan simply means business, heavy like a good sledge and nearly as strong. When dropped on its lid, Nalgene's Everyday Tritan bottle popped open, but neither the hinge nor the opening sustained any damage.