Free movement
Article 4
1. Packaging shall only be placed on the market if it complies with this Regulation. 2. Member States shall not prohibit, restrict or impede the placing on the market of packaging that complies with the sustainability, labelling and information requirements laid down in or pursuant to Articles 5 to 12. 3. If Member States choose to maintain or introduce national sustainability requirements, or information requirements additional to those laid down in this Regulation, those requirements shall not conflict with those laid down in this Regulation and the Member States shall not prohibit, restrict or impede the placing on the market of packaging that complies with this Regulation for reasons of non-compliance with those national requirements. 4. At trade fairs, exhibitions or similar events, Member States shall not prevent the showing of packaging which does not comply with this Regulation, provided that a visible sign clearly indicates that such packaging does not comply with this Regulation and that it is not for sale until it has been brought into conformity.