Good point about large concrete parking garages. I do keep my GHB in the truck as part of a 96 hr kit, but when I'm out and about I park in the open so a building collapse is not a concern, unless I'm in it.

As it is, if I need to use that bag (Camelbak Ridge Runner) as a GHB, I'll repack it based on conditions at that time. I may just decide to stay with the truck. It depends. . .