• IATA requires that inner packagings be well constructed, and packings must meet additional standards depending on the material (plastic, glass, metal, etc.)

Plastic, glass, and metal inner packagings must be well constructed. The following requirements also apply to inner packagings:

• Plastic: The packaging and closures must be good quality and appropriate for the substance. Closures must be tight and must prevent leaks. Any stoppers must be held in place by tape or wire, for example.
• Glass: The packaging and closures must be good quality and appropriate for the substance. Closures must be tight and must prevent leaks. Any stoppers must be held in place by tape or wire, for example. If the container has a neck with screw-on caps, the caps must have a liner resistant to the contents. Glass ampules must be heat sealed and gas and liquid tight. They cannot react with the contents. Glass tubes, if permitted, must be thick walled and defect-free.
• Fiber cans or boxes: Packages must be good quality. Metal tops and bottoms can be used.
• Paper bags: Kraft paper of at least two sheets must be used.
• Plastic bags: Weld-seams and closures must be sift-proof and bags must be at least 0.1 millimeter thick.
• Aerosol inner packaging requirements can be found in the IATA DGR Sections 6.1.7 through 6.1.9.