Polypropylene twinwall sheet, Coroplast®, or simply corrugated plastic, is an economical material that is light-weight and durable. In twinwall form, sheets are commonly used for both indoor and outdoor signage, as well as trade show and retail displays. Polypropylene twinwall also makes an economical and lightweight choice for building contractors who use it for countertop templates, concrete molds, and temporary floor coverings. Fluted polypropylene also makes a popular choice in packaging as a more durable, water-resistant, and reusable or recyclable alternative to paper-based packaging.