For those who prefer a roomy bottle with a smaller opening, the Nalgene Tritan Narrow Mouth 16oz. Bottle offers Made in the USA durability and an easier opening to drink from. This bottle offers all the same advantages as Nalgene’s wide mouth bottle, with a top that minimizes the chance of spills and a cap that never gets lost. The bottle features printed graduations for easy measuring. Like all Nalgene products, this is a reusable water bottle that helps reduce waste and can tolerate temperatures from boiling to freezing.