Empty space ratio
A packaging-volume measure under PPWR Article 24, capped at 50% for grouped, transport and e-commerce packaging from 2030.
Also called: void ratio
Not “the part of the box that is not product”, although that is how it gets described. The Article 24 calculation works from packaging volume, and the methodology is still being filled in by implementing acts — so the number you compute today with a rule of thumb is not necessarily the number the Regulation will ask for.
What is settled is the shape of it: a 50% maximum for grouped, transport and e-commerce packaging, from 1 January 2030. It is the requirement most likely to change a specification you already have, and one of the few where the compliance incentive and the freight incentive point the same way.