Depending on the type of industry and the amount of information to be shared inside a press kit they will often contain different materials but any top PR firm will ensure that a press kit isn't too thick so that it does not overburden someone but that it also shares an appropriate amount of information. A press kit is something that is often created in tandem with the work that's done in other areas of public relations and may expand on what a person might read on a blog by including extra information such as photographs and biographies of pertinent individuals.