In some countries, the packaging tax is based on the rigidity of the packaging. This is especially applicable to plastic packaging
A common way to categorize packaging based on its physical characteristics is to classify it as either "rigid" or "flexible."
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Rigid Packaging: This type of packaging maintains its shape and structure under normal conditions. Examples include glass bottles, metal cans, hard plastic containers, and certain types of cardboard or paperboard boxes. It offers robust protection but typically weighs more and can be bulkier.
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Flexible Packaging: As the name suggests, this type of packaging can easily change shape. Examples include plastic bags, pouches, shrink wraps, and certain thin films. Flexible packaging often weighs less and can be more space-efficient, especially when empty. It's increasingly popular for food products due to innovations in barrier films that can extend shelf life.
There's also a third category, "semi-rigid," which falls between the two. An example of semi-rigid packaging might be a thick plastic tub or a thin plastic clamshell container. It has some shape stability but can be deformed more easily than rigid packaging.
It's worth noting that the distinction between these categories can sometimes blur, especially with advancements in packaging technology. However, the basic classification of rigid vs. flexible remains a useful way to describe and differentiate packaging materials.