May be packed together with articles covered by the same UN number. 

Shall not be packed together with goods of Class 1 having different UN numbers, except for 

(a) their own means of initiation, provided that 
(i) the means of initiation will not function under normal conditions of carriage; or 
(ii) such means have at least two effective protective features which prevent explosion of an article in the event of accidental functioning of the means of initiation; or
(iii) when such means do not have two effective protective features (i.e. means of initiation assigned to compatibility group B), in the opinion of the competent authority of the country of origin *) the accidental functioning of the means of initiation does not cause the explosion of an article under normal conditions of carriage; 

(b) articles of compatibility groups C, D and E. 

Shall not be packed together with goods of other classes or with goods which are not subject to the requirements of RID. 

When goods are packed together in accordance with this special provision, account shall be taken of a possible amendment of the classification of packages in accordance with 2.2.1.1. 

For the description of the goods in the transport document, see 5.4.1.2.1 (b).

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*) If the country of origin is not an RID Contracting State, the approval shall require validation by the competent authority of the first RID Contracting State reached by the consignment.