US Department of Transportation (DOT) Pipeline Hazardous Materials Safety Administration
Topic 3 — Packaging  
Introduction
Topic1: The Hazadous Materials Table
Topic 2: Hazard Classes
Topic 3: Packaging
 Topic 4: Marking, Labeling, and Placarding
Topic 5: Shipping Papers
 Topic 6: Incident Reporting
Help Resources HMR
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§ 171.8 § 172.101
5 OF 29
Packing Group examples
Packing Groups (PG)

The HMR define three packing groups which are based on the degree of danger presented by hazardous materials:

PG I    Great danger;
PG II   Medium danger; and
PG III  Minor danger.