I was talking with a Bethelite about this subject recently, as I'd seen a reference on this board to them all having "Armageddon Bags". He laughed and assured me it was more practical than that. The fact that many Bethelites had the same one was due to the WTS arranging for group discount.
It seems that in the wake of Hurricane Katrina and the tsunami in Indonesia, the WTS thought it was just good practice for anyone to be prepared for short-notice evacuation. (The perfect example is the news of the large earthquake just a few hours ago that has sent pretty much anyone living near the Indian Ocean running for the hills. I'm sure anyone who had a "grab-and-go" bag is really glad they had prepared one.)
I believe several years ago all congregations received the direction to maintain an emergency contact list (including an alternate contact), so that if everyone had to relocate in an emergency, they'd have the means to ensure everyone made it somewhere safely. I seem to remember that was when they also recommended pulling together a prepared collection of emergency supplies.
biometrics...hope your bag continues to gather dust!
R_O