Which feature that reduces internal pressure is not permitted for air transport?

• A. Venting
• B. Ice packs
• C. Cushioning materials
• D. Sealed containers

Answer: (A)

The main idea here is safety in packaging for air travel and how pressure changes are handled. Venting a package to relieve internal pressure is not allowed because it would release gas or contents into the aircraft environment. In flight, even small releases can contaminate the cargo hold or cabin, pose toxic or flammable hazards, and create dangerous conditions for people and equipment. So reducing internal pressure by venting is not permitted.

Ice packs and cushioning materials are suitable options because they don’t release contents or gases; ice packs simply control temperature, and cushioning materials absorb shock to protect the contents during handling and transit. Sealed containers are also appropriate as long as they are leak-proof and able to withstand the pressure changes of flight, ensuring the contents remain contained without needing to vent.

So, the feature that reduces internal pressure by venting is the one not permitted for air transport.