DG cargo service Definition Classification Application Procedure & Packing of DG Restriction by Company / Port Dangerous Cargo Shipping Procedure The acceptable packing for all UN NO (Proper Shipping name) of DG cargo is regualted by IMDG Code. The packaging, is not specified in IMDG code, is unacceptable. A. Marking of Packing - Detailed information for packaging should be marked on surface of packaging. - Each packing should be marked symbol on surface. B. Example for improper packing & stuffing.