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Title 49 of the Code of Federal Regulations (usually abbreviated "49 CFR") is the set of federal rules that covers the transportation of hazardous materials. As a shipper, it is your responsibility to know the rules of shipping and comply with them. Your shipping company may have further rules that go beyond what the law requires.
If you need to send a quantity of materials that the government labels "hazardous" (these could include used auto parts, dry ice, batteries, compressed gas, magnets, paints, spray cans, office supplies, even perfume), you may find it helpful to work with a company that specializes in packing goods to comply with 49 CFR rules.