Type A package must be marked "Type A". Type B packages must be marked " Type B(U)" or 'Type B (M)" as applicable and type C packages must be marked " Type C" . In addition, if the gross weight is greater that 50 kg. the allowable gross weight of the package must be marked. Type B and C packages must also have the "trefoil" Symbol embossed or stamped on the outermost receptacle which is resistant to the effects of fire and water.(DGR 10.7.1.3).