Packaging design serves multiple purposes, including protecting the product, enhancing its appearance, and providing information about the product.

Texture is not typically considered an element of packaging design, as it is not a visual element.

Structural design refers to the design of the packaging's structural components, such as its shape, size, and materials.

Quaternary packaging is not a type of packaging design. It refers to the packaging of multiple tertiary packages into a single unit.

Graphic design refers to the design of the packaging's visual elements, such as its colors, typography, and imagery.

Sustainability is not a principle of packaging design, as it is not directly related to the design of the packaging itself.

Functional design refers to the design of the packaging's functional components, such as its opening and closing mechanisms.

Glass is not a type of packaging material, as it is not typically used for packaging consumer products.

Industrial design refers to the design of the packaging's industrial components, such as its manufacturing processes and materials.

Valve is not a type of packaging closure, as it is not used to seal the packaging.

Environmental design refers to the design of the packaging's environmental components, such as its recyclability and compostability.

Digital printing is not a type of packaging printing process, as it is not typically used for printing on packaging materials.

Cultural design refers to the design of the packaging's cultural components, such as its symbolism and imagery.

Chemical testing is not a type of packaging testing, as it is not typically used to test the performance of packaging materials.

Regulatory design refers to the design of the packaging's regulatory components, such as its labeling and compliance with government regulations.