Regulations Governing the Safe Transport of Dangerous Goods by Air Article 7

Packagings for which retention of a liquid shall be capable of withstanding, without leakage, the pressure stated in the Technical Instructions.Inner packagings shall be so packed, secured or cushioned as to prevent their breakage or leakage and to control their movement within the outer packaging(s) under normal conditions of air transport. Cushioning and absorbent materials shall not react dangerously with the contents of the packagings.No packaging shall be re-used until it has been inspected and found free from corrosion or other damage. Where a packaging is re-used, all necessary measures shall be taken to prevent contamination of subsequent contents.If, because of the nature of their former contents, uncleaned empty packagings may present a hazard, they shall be tightly closed and treated according to the hazard they constitute.No harmful quantity of a dangerous substance shall adhere to the outside of packages.