Definition
The outermost packaging used to enclose a hazardous material shipment for transport. For dry ice shipments carried aboard aircraft, the outer shipping container must be designed to allow the release of carbon dioxide gas as the dry ice sublimates, preventing dangerous pressure buildup.
Plain English
The outside box or case that holds a shipped item. When the item inside is dry ice, this outer box must let gas escape so pressure cannot build up.
Context Anchor
Seen when reviewing or accepting packages that contain dry ice in aircraft baggage or cargo areas.
Why Pilots Care
Improper outer containers can allow pressure buildup or oxygen displacement in the cabin or cargo compartment, creating safety hazards during flight.
Grounding Statement
Dry ice slowly changes into gas, so the outside package must let that gas escape safely.
Intuition Check
Do not assume this just means any strong outside box. In this context, the important point is that the outside package must be suitable for dry ice and must not seal the gas inside.
Example Sentence 1
Before loading the dry ice shipment, the pilot confirmed the outer shipping container was properly labeled and vented.
Example Sentence 2
Inspect the outer shipping container for damage or blocked vents prior to departure.