I always have my keys, and I keep them on a 'biner with a Fenix O1 & a Spyderco Ladybug3 in ZDP-189. Generally I have a pen in a pocket somewhere. This is just EDC, if I'm headed out doors for the day I'm better packed. But at a minimum I at least have a knife and light. Both come in handy almost every day.
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“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman