Why is it important that hazardous materials containers used for a specific material match the material's compatibility requirements, not just its general packing group?

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1. Any container meeting the correct packing group is automatically compatible with every material assigned to that same group, without exception
2. Compatibility only matters for materials in the flammable gas hazard class
3. Some materials can chemically react with certain packaging materials, weakening the container even if it meets the general packing group standard
4. Container material has no relationship to chemical compatibility with the cargo

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