An obvious example is large oil drums. They can contain flammable or toxic material, should be left alone, not handled or removed, and reported to proper authorities right away. However, less obvious items, such as plastic boxes or bags with unusual symbols should be handled similarly. Medical waste, for instance, can come in small boxes or packages– a fine looking glass jar may contain toxic material– and explosive devices may come in different shape and packaging. Often (but not always) hazardous materials are labeled.