The 64 oz. Bottle takes insulation to the next level, complete with a double-wall vacuum to keep drinks cold or hot for hours. Perfect for remote campsites and harsh worksites alike. Unlike narrow-mouthed water bottles that are a hassle to fill or rinse, our Rambler Bottle features Over-the-Nose(TM) Technology for easy loading, drinking, and cleaning. And it�s BPA-free.