Exjwlemming,
A theory about the purpose of disaster preparedness kits or "go bags":
1. If the rank & file have them, the org saves a lot of money if there is a disaster (don't have to feed people who already have food, but they still see an increase in donations!!!)
2. If the r&f get messages every once in while that they should make sure they have one, they think the "slave" has been given some divine insight that the Great Tribulation is near and it keeps them obedient.
EDIT: As Barrold Bonds posted, it is practical to have a "go bag". If you live in area that floods or is earthquake prone, you should have one.
However, is it scriptural? Were the Christians fleeing to the mountains told to have "go bags" ready? They were actually told to 'not take anything out of the house!'