If the Steel drum is not overpacked, all is clear, and there is no need to indicate the quantity on the packages. However, as the Steel drum is overpacked, it poses a slightly complicated picture. The regulation does not prohibit the entry of quantities, The basic requirement of DGR 18.104.22.168 (c) is that the quantity “must” be indicated on the packages and provides exceptions to three bullet points. The purpose of the Dangerous Goods Regulation is to make everything clear and understandable to whoever is handling the shipment. In the current case, it is better for clarity to indicate the quantity on each of the packages. You must not forget the objective of the Regulation which is to transmit a clear and easy to understand message, and therefore must apply the rules logically.