We have ours ready in case of fire or disaster.
A change of clothes, water, food, a small bowl, copies of passports and the like, light, radio, extra batteries, first aid, stuff for kids. I think there's a cloth in there that has like 20 different useful instructions on how to use it for various emergencies.
I might have also put in duct tape, cordage, a utility knife,
soap, and a few other things.
If there's a big earthquake, even if we are okay for the primary, there will likely be intense aftershocks, so there's a decent probability of evacuation.
Fire is questionable as to how big and where whether we would even go for the bug out bags or just run out the door. Gotta get the kids first anyway.
Landslides probably won't give us warning
enough to matter.
If the occasional flooding here gets worse despite all the engineering work the locality has been doing, the bags might come in handy.
Sudden war might be another trigger...
In any case it's nice to know there's a bag ready that we prepared when we were thinking clearly and not panicking.