One set of strings
One assorted bunch of strings, mostly ofthe size that I tend to break the most
Electronic Tuner (Intellitouch-the most practical!)
string winder
tuning fork
A Copenhagen Chewing Tobacco tin, that I use to carry my picks- assorted flat picks, my favorite thumbpick, (in the rare case I want to use one); a plastic gizmo to pry out bridge pins
needlenose pliers swiss army knife (in my pocket) LR Baggs Para Acoustic DI+Equalizer
Guitar cord
2 patch cords
extra 9v batteries
folding music stand Pen and sharpie
Small disposable flashlite(because all pa systems in dark clubs seem to be black)
a bunch of rubber bands
Personal songbook binder
Bluegrass Songbook

sometimes, a bottle of water Some of this is in a flat zip pouch, the rest is in a 12x12 soft satchel that also attaches to the side of my zippered soft guitar case.

Not in my case,but almost indispensable now: cell phone
(i'm gonna be late--or, where are ya,we have a gig in half an hour?--or, help i'm lost how do I get there?--)