No, they're not. That would be far too heavy. The containers are regular aluminum lined unit load devices (https://en.wikipedia.org/wiki/Unit_load_device https:

No, they're not. That would be far too heavy. The containers are regular aluminum lined unit load devices (https://en.wikipedia.org/wiki/Unit_load_device https://en.wikipedia.org/wiki/Unit_load_device). They are not resistant to explosives. Some airlines that are particularly sensitive (El Al, for example) have additional mitigations like a reinforced floor between the cargo and passenger compartments or one particular piece of the cargo hold that's more structurally sound for sensitive items, but wide body aircraft do not have "containers that are built to withstand bombs". It's just not practical to do so.