Many people interested in being a little more self-reliant than the average person have an 'Every Day Carry' (EDC). Mine is a Vanguard EDC Maximiser.
Leatherman additional bit kit
Spare battery for my phone
Swiss Army Knife
LAIX B2W Tungsten Steel Tip Pen
Sharpie black permi marker
Spare batteries AA and AAA
I chuck it in my bag every day and it's suprising how often I need bits. I like the idea of being a little more squared away than everyone else should I get stuck away from home. Whilst it's not a "get you home Bag" (GYHB - a topic for another day!) it's enough for the short term. What do you carry?