For a liquid Category B shipment, which packaging feature is essential?

• A. No outer packaging is required
• B. An inner primary container with a leakproof cap
• C. A single glass bottle with no secondary containment
• D. A plastic bag is sufficient

Answer: (B)

Containment of the liquid at the inner container level is essential for a liquid Category B shipment. In this packaging system, the liquid must be placed in an inner primary container that is leakproof and sealed before it’s surrounded by secondary containment and, finally, an outer protective packaging. The leakproof inner container is the key safeguard because it prevents any liquid from escaping if the package is damaged or inverted during transit. Without a leakproof inner container, leaks can occur regardless of how sturdy the outer layers are, which would compromise safety and regulatory compliance. The other options fail because they don’t guarantee this fundamental containment: skipping outer packaging isn’t allowed by regulations, using a single glass bottle without secondary containment neglects the necessary secondary containment and protection, and a plastic bag does not provide a leakproof primary container or meet the required packaging standards.