For lots of info, how about this:

Get a small address book with a cardboard cover. Pull out the guts and discard.

Type up your information, and print it into a long, skinny (to fit the cover) set of pages, tape the ends together in the right place, then accordion-pleat the paper and glue one end into the back cover. When opened the whole long stream of info would hang down.

Write 'Medical History' on the cover in a size to be seen. You could tie a piece of heavy-duty thread around it and fasten with a knot. (All medical personnel have scissors, and I'll bet every LEO has a multi-tool. Of course, if you could find a clear plastic sleeve it would fit into, that would be good, too.

Just an idea.

Sue