Which material is NOT commonly used for packaging?

Rubber bands are not commonly used for packaging in the same way that cardboard boxes, plastic bags, and glass jars are. Packaging materials are typically chosen for their ability to protect products, provide a barrier against elements, and facilitate handling and transport.

Cardboard boxes are a foundational packaging material, widely employed for shipping and storing items due to their strength and recyclability. Plastic bags offer flexibility and moisture protection, making them a popular choice for various products, especially in retail. Glass jars are utilized for their durability and ability to preserve food or other items for extended periods, contributing to shelf life and attractiveness in presentation.

In contrast, rubber bands serve a specific purpose more related to bundling and holding items together rather than acting as a protective packaging solution for products. Therefore, while they may have applications in various settings, their role is not aligned with the primary functions of packaging materials like the others listed.