The 36 oz Rambler Bottle features a durable 18/8 stainless steel construction with a No Sweat design to keep condensation from collecting. Like the rest of the Rambler Bottles, it also has a TripleHaul cap for superior portability. And unlike narrow-mouthed drink bottles that are a hassle to fill or rinse, the Rambler Bottle features Over-the-Nose technology for easy loading, drinking, and cleaning. And it?s BPA-free.In other words, the Rambler Bottle is the only insulated container for cold (or hot) beverages that?s built for the wild.