The degree and manner of packing of bulk materials influences all phases of their loading, such as by a front-end loader or a dragline, and their mechanics of flow, such as through a binhopper or an ore pass. The most important quantity in analyzing the handling of a bulk material is its shear strength, which depends primarily on the same parameters as those that determine the packing state. Some of these are size, size distribution, moisture content, particle shape, particle orientation, and cohesion. The variables that affect the packing state are vibration, pressure, intensity of deposition, velocity of deposition, and, when the material is confined, container used. The analysis of packing by a number of investigators has been done almost entirely with spherical particles. Most of these studies have dealt with monosized spheres. These is scant information on particles with angular shapes. Since most of the investigations by far have been concerned with ceramics and powder metallurgy, the particle sizes and ranges of size distribution have been small compared with those generally found in mining after fragmentation.