This is a great question. I've been sitting here for 5 minutes trying to think of an answer, but everytime I come up with something I cross it off.
It would end up being something for my kids - a favorite toy, or maybe our pet tortiose.

I live in hurricane country, but we get enough warning to
pack up our cars with the photo albums, etc. If I had to leave RIGHT NOW, with just the basic survival stuff packed, I haven't the slightest idea
what I'd pick up on my way out of the house.
Let's hope I never have to find out that way.