The YETI Rambler® 36oz Bottle takes insulation to the next level, complete with a double-wall vacuum to keep drinks hot or cold for hours. Perfect for remote campsites and rough work sites alike. Just like the other Rambler® Bottles, you'll find the 64 oz outfitted with a Triple Haulcap™, making it easy to grab on-the-go and even easier to open up when you're ready to wet your whistle. 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.