Nalgene Flask 12oz Slate Blue The Nalgene Flask 12oz in Slate Blue is a premium water bottle designed for outdoor activities like camping and hiking. With a volume of 12 fl oz, this flask is designed to be leak-proof and insulated, keeping your drinks at the perfect temperature. Made with high-quality stainless steel, plastic, and metal materials, it is both durable and reusable. The sleek blue color adds a stylish touch to your hydration gear, making it a must-have for any adventure seeker.