Wide Mouth 32 oz Sustain

The 32-ounce Wide Mouth has anchored backcountry hydration for generations, and the Sustain iteration updates the formula using Tritan Renew copolyester derived from 50 percent certified recycled materials. In the hand, it behaves identically to the historic model. The material remains rigid, shatter-resistant, and neutral to taste and odor, showing no structural compromise despite the transition to recycled feedstock.

In the field, the 63mm opening remains its defining strength and its primary quirk. It readily interfaces with standard water purifiers, accommodates snow or ice cubes, and cleans out easily at camp. However, drinking from it while walking or driving invites spills unless paired with an aftermarket splash insert. Weighing just over six ounces empty, it delivers reliable volume without the heft of vacuum-insulated steel. Mountaineers still rely on its semi-flexible, gasket-free threaded cap for hot-water bottle duty inside sleeping bags, where failure is not an option.

Thermal performance is non-existent: cold drinks sweat heavily in humid conditions, and liquids freeze solid in exposed winter environments without an insulated sleeve. Ultralight hikers looking to shave grams will continue to choose disposable bottles, but for general backpacking, cragging, and canoe trips, this remains the gold standard for indestructible, low-maintenance hydration.