Bulk vs. Large Means of Containment

Bulk, Large Means of Containment, and IMDG Equivalents: Not Created Equal

Terminology in dangerous goods regulations can be deceptively similar—and surprisingly different. One example that can cause confusion is the distinction between the terms bulk packaging and large means of containment. Although they sound alike, they’re not interchangeable across regulatory frameworks.

This topic arose during a recent help desk call, where a customer requested UN number placards for a large EV battery shipment – compliant with Canadian regulations. At first glance, this might raise questions: why placard something that doesn’t meet the definition of a bulk package?

The answer lies in how different jurisdictions define and apply these terms. What qualifies as a bulk package in the United States under 49 CFR isn’t necessarily the same as a large means of containment under Canada’s TDG Regulations. To make things even more interesting, the IMDG Code throws its own definitions into the mix.

Why Dangerous Goods Terminology Matters

Let’s break it down.

When transporting dangerous goods, terminology can differ significantly between regulations—even when describing similar concepts. Understanding how terms like “bulk,” “large means of containment,” and “large packaging” or “bulk container” are used in 49 CFR (U.S.), TDG (Canada), and the IMDG Code (international maritime) is essential for compliance, especially in multimodal and cross-border shipments.

“Bulk” in 49 CFR (U.S. Department of Transportation)

Definition (49 CFR §171.8): Bulk packaging means a packaging (other than a vessel or barge), including a transport vehicle or freight container, in which hazardous materials are loaded with no intermediate form of containment, and which has:

A capacity greater than 119 gallons (450 liters) for liquids;
A net mass greater than 882 pounds (400 kilograms) or a capacity greater than 119 gallons for solids;
A water capacity greater than 1,000 pounds (454 kilograms) for gases.

Important notes:

Focuses on direct containment of hazardous materials.
Encompasses containers like cargo tanks, tank cars, portable tanks, and IBC-type containers if used without inner packaging.
Triggers specific regulations for placarding, marking, and segregation during transportation.

“Large Means of Containment” in TDG (Canada)

Definition (TDG Regulations, Section 1.4): Large means of containment means a means of containment with a capacity greater than 450 liters.

Important notes:

Defined only by volume, not by contents or packaging configuration.
Encompasses a wide range of containment systems:
- Intermediate bulk containers (IBCs)
- Portable tanks
- Cargo tanks
- Freight containers
Does not require bulk loading—a large means of containment may still hold smaller packaged goods.

So, what’s the difference?

While “bulk” in 49 CFR implies direct containment, “large means of containment” is broader and can apply to both bulk and non-bulk situations, as long as the container exceeds 450 L.

How the IMDG Code Uses Similar—but Different—Terminology

Just for fun, let’s look at how the IMDG further differs (ever so slightly)

Equivalent Terms in the IMDG Code (International Maritime)

The IMDG Code (based on the UN Model Regulations) doesn’t use the terms “bulk” or “large means of containment” in the same way. Instead, it uses context-specific terms that correspond to either the containment format or the volume:

Bulk (as a mode of transport)

Definition (IMDG Code, Chapter 1.2): Bulk means the transport of unpackaged solids or liquids in a container, tank, or cargo space without intermediate packaging.

Examples include:

Liquids in portable tanks or tank containers
Solids (e.g., granules, powders) in bulk containers or ship cargo holds

Important notes:

Identifies a form of loading—no inner packaging.
Can apply to solids, liquids, and liquefied gases.

Bulk Container (for solids)

Definition (IMDG Code, Chapter 1.2): Bulk container means a container intended for the transport of solid substances in bulk without intermediate packaging.

Examples include:

Freight containers loaded with powders or granules
Hopper-type containers

Portable Tanks / IBCs

Although not explicitly termed “large means of containment,” portable tanks and IBCs under the IMDG Code functionally resemble the large containers defined in TDG and 49 CFR.

Portable tanks: Used for bulk transport of liquids and gases
IBCs: Intermediate bulk containers with capacity up to 3,000 liters

Comparing the Terminology Across Regulations

Here is a handy comparison between the three:

Term	Jurisdiction	Volume Threshold	Inner Packaging?	Typical Use
Bulk Packaging	49 CFR (U.S.)	>119 gal/400 kg	No	Direct loading of hazmat in tanks or IBCs
Large Means of Containment	TDG (Canada)	>450 L	May or may not	Any container >450 L (bulk or not)
Bulk (mode of transport)	IMDG Code	Contextual	No	Liquids/solids loaded without packaging
Bulk Container	IMDG Code	>450 L (typically)	No	Solids in direct contact with container
Portable Tank / IBC	IMDG Code	450–3,000 L	No (bulk), or with	Tanks for bulk liquids, IBCs for solids

Why Understanding These Terms Matters

The term “bulk” in the U.S. (49 CFR) specifies both content and volume. Canada’s “large means of containment” is size-based only and doesn’t require direct loading. The IMDG Code uses descriptive categories instead of “bulk” as a container class, focusing on transport method (bulk) or container type (portable tank, IBC, freight container). Understanding these terms ensures proper classification, documentation, and emergency response planning, especially in multimodal or international shipments.

Stay up to date and sign up for our newsletter!

We have all the products, services and training you need to ensure your staff is properly trained and informed.

Bill of Lading Forms

Placards

4GV UN Variation Boxes

Tags:

Bulk vs. Large Means of Containment