Can all Chemicals be Lab Packed together?

It is the responsibility of the "Lab Packer" to identify and properly segregate each substance based on the US Department of Transportation’s regulations. Many flammable substances cannot be packaged with other chemicals because they are in different hazard classes, for example, picric acid is one chemical that becomes explosive with age and must be handled with extreme caution and expertise. It is therefore imperative, whether for a Chemist or a Hazardous Waste partner, that the person responsible for lab packing has knowledge of the substances they are working with.