ESD Conductive is a large manufacturer of antistatic bags.An antistatic bag is used for storing electronic components to prevent damage caused by electrostatic discharge (ESD).
Dissipative antistatic bags are made of standard polyethylene with a static dissipative coating or layer on the plastic. It dissipates the charge to ground (i.e., whatever other surface it is touching). This bridge to ground is achieved with the inclusion of a tallow amine on the bags surface which attracts moisture that can conduct the charge to another surface, or to the atmosphere itself. In this sense, this type is truly 'antistatic' in that it hinders the formation of static charges. It, however, is not resistant to electrostatic discharge; if something else with a charge touches the bag, its charge would easily transfer through the bag and its contents. These bags are usually pink or red in color because of the dissipative chemical layer. Black bags also exist, wherein the polyethylene is manufactured containing trace amounts of carbon, forming a partial shield, though not a complete one. 
Conductive antistatic bags are manufactured with a layer of conductive metal, often aluminum, and a dielectric layer of plastic covered in a static dissipative coating. This forms both a shield and a non-conductive barrier, shielding the contents from static charge via the Faraday cage effect. These bags are preferred for more sensitive parts, but they also see use in environments where sparks would be hazardous, such as oxygen-rich areas in aircraft and hospitals. Metalized bags are more fragile than their nonmetal counterparts, however, as any puncture compromises the integrity of the shield. In addition, they have a limited shelf life, as the metal substrate can deteriorate over time. These bags are often gray or silver owing to the metal layer, while still being transparent to some degree.