Introducing the Classic Narrow thermal flask from the renowned brand Klean Kanteen. Crafted from durable stainless steel, this insulated flask is both water and leak-proof, ensuring your beverage stays securely contained. With its Climate Lock double-walled vacuum insulation, it keeps your drink hot for up to 16 hours and cold for up to 41 hours. Its lightweight design, compact dimensions, and 355 ml capacity make it the perfect companion for on-the-go hydration. Furthermore, this flask is BPA-free, guaranteeing it is free from harmful substances, and it is conveniently dishwasher safe for easy cleaning. Suitable for both children and adults, the Classic Narrow thermal flask is ideal for taking to school, work, or a day out. Experience the convenience and reliability of Klean Kanteen with this sleek black flask.