The first coffee outdoors is better than the same coffee indoors, and nobody has ever properly explained why.
The Hemingway Camping Mug is built for that cup. Enamel over tin, the way camp mugs have always been made, holding twelve ounces and broad enough at the base to stay put on a tailgate or a flat rock. It is meant to be knocked about rather than kept in a cupboard, and the chips it picks up along the way are part of the point.