In emergency situations the hazard classification system of the Department of Transportation is useful, familiar, and available on the scene. This document is arranged by Department of Transportation Hazard Class and shipment volume. Within some classes, a distinction is made between bulk and package shipments. Bulk shipments are those that equal or exceed 110 gallons liquid (415 liters) or 1000 pounds dry (450 kilograms) measure, such as tank car or tank truck. Package shipments are those that are less than 110 gallons liquid or 1000 pounds dry measure per package.