Changing packaging material can change weight, protection, and handling. The evaluation should start with the required function, rather than an abstract preference. A lighter container may be useful, but it must retain the conditions necessary to transport and deliver the product properly.
I propose to compare alternatives on the same path and with the same needs. Damage, additional materials and new shipments must be included in the reading. Environmental claims require relevant data and verification; the type of material alone does not demonstrate overall improvement.
Let's imagine a package that uses less material but requires extra protection during transport. The initial reduction may be partial. A representative test allows to know the actual system, avoiding conclusions based only on the package seen in isolation.
The verification observes product integrity and resources employed. The best choice depends on the conditions of the service and the alternatives available. A useful comparison preserves the function of the packaging and makes the necessary changes visible, so that the environmental assessment can start from data consistent with the real work.