What should you look for in a preflight inspection of the lithium ion bag?

During a preflight inspection of a lithium ion bag, ensuring that it is intact and properly sealed is crucial for safety. An intact bag indicates that the battery is securely housed and has not been damaged in transit, which could lead to battery leaks or potential fires. A properly sealed bag helps prevent any accidental exposure to the battery terminals and minimizes the risk of ignition caused by short circuits or other hazards. In emergency situations, these precautions are vital in preventing incidents related to battery failure.

The other factors, like presence of costs, compliance with weight limits, or the bag being empty, don't directly pertain to the critical safety aspect of the lithium ion bag's integrity. While those factors may be important in other contexts, they do not address the immediate concern of ensuring the bag is secure and safe for transport.