Solar-powered keychain flashlight—can’t praise it enough. Not only does it clip right on my gig bag, but it’s got me out of more than a few jams, both while setting up at dim venues and during power outages at home. Light’s not stadium-bright, but the thing just keeps going, no batteries to worry about. I even used it once to signal my neighbor when his generator kicked out in a bad storm.
Also, I always stash a few guitar picks (not just for tunes)—they’re handy for scraping gunk, flipping tiny switches, or as emergency shims if something’s rattling apart. Never saw anyone mention instrument picks in a kit, but they’re surprisingly versatile and