More to explore:
MAKE YOUR OWN DIY FIRST AID KIT FOR THE ROAD! (the old out of service cell phone idea was new to me) some good ideas!
DIY tackle box first aid kit + a list of suggested supplies from the Red Cross. Emergency prep. Camping. Road trips.
first aid tackle box for road trip
DIY first aid kit for your car - via One Good Thing by Jillee (at first I thought this was a Caboodle! it's a fishing tackle box!)