This article describes a set of demonstrations and experiments involving a polymer product that can be used in a polymer chemistry lab course or incorporated into more traditional type chemistry courses (e.g., general chemistry and instrumental analysis). Through thermal analyses of poly(ethylene terephthlate) (PET) bottles, students are introduced to the relationships between processing, morphology, and physical properties of polymer materials. Although the complete set of exercises incorporates differential scanning calorimetry, important relationships can be demonstrated with just PET bottles and a laboratory oven. A "real-world" problem-solving experience is provided through a multi-week lab project in which students assume the roles of analytical chemists for a hypothetical PET bottle manufacturer.