Shop Klean Kanteen 12oz Kanteen Wide Insulated. From lunch boxes to lattés, the 12oz Kanteen® Insulated`s small size gives you ultimate versatility and performance. Load it up with chunky stew or ravioli for a hot lunch today. Then take it with you on the road filled with a few shots of espresso or a small cappuccino. Its compact size makes it the perfect container for food and also a great mug.