Polypropylene tape - Economical and lightweight Polypropylene strapping is economical and designed for use in light to medium weight packaging. PP strapping is often used to bundle lower weight boxes and packages. And it is used in situations where there is no concern for high initial tension and only low retained tension is required. Polypropylene also offers greater flexibility, which is better for cargo that is fragile or will be transported for shorter periods of time.