I also recommend that people carry a basic first aid kit that includes a space blanket, Advil, lighter, dry paper (for starting a fire), hockey tape and some band-aids. The ride I was on with Noel from Knolley Bikes when he hurt his knee really opened by eyes to being able to repair the person as well as the bike.
good points,but dont go starting a fire this time of year!
not sure,but the advil may clash with hospital meds as well.
the most important thing I have found is riding with enough people with enough gear spread amongst them to reasonably deal with most problems.
Pastor of Muppets