How many lithium ion containment bags are onboard?

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A lithium ion containment bag is a fire-resistant pouch used to isolate a damaged or overheated battery so its flames or hot gases don’t spread. On typical commercial flights, there is one containment bag kept in an accessible kit so the crew can secure a problematic battery quickly and prevent escalation. That’s why the onboard count is one. Zero would leave no dedicated containment tool, while two or three would exceed the standard inventory for this item.