What would stop you from using a plain old briefcase and add in a first aid kit and survival supplies? I actually carry a briefcase to work everday as I actually need it for documents and such.

I carry my lunch, umbrella, some first aid supplies, water, and other things that I generally can't carry on my person in a corporate environment such as my Leatherman Wave.

I guess my question is, what added benefits would your design be? And would people want to carry a briefcase that is just full of those things and served no other practical purpose?