In my backpack I carry;
Leatherman
Paracord
Gaffers tape
Wire tires, good ones with the metal tab
Band-Aids
Extra binding screws
Couple of hand warmers
Radio, FRS/GMRS. They aren't much but it's better than shouting sometimes.
Advil
Munchies
Waters
Bic lighter, never know when you want to set stuff on fire!
I'm sure I'm forgetting something...