Our insulated flask has inner and outer linings made of high-quality 304 stainless steel. The double-walled insulation maintains the temperature and flavor of drinks for up to 24 hours. Enjoy cold refreshments or hot drinks whenever, wherever. The materials we use are guaranteed non-toxic. Works with any type of beverage. This reusable bottle fosters a "0" waste lifestyle. This large water bottle features a stainless steel cup and the one companion cup, sweat-proof exterior. The firm-grip handle, removable shoulder strap, and leak-proof design make it highly portable!