Every few weeks or months I have that shift that makes me wish I still carried a fanny pack with all the extra odds and ends in it. It's dorky, but nice to have those random bits and pieces.
I'm pretty basic as far as what I carry: Narc and ambulance keys, phone, radio, shears, a pair of gloves, wallet, chapstick, pens, writing pad, nicotine (in one form or another).
My extra bag that hangs out in the ambulance is another story…. I carry a few OTC meds for myself (tums, immodium, ibuprofen, my BP meds), bandaids, various chargers, extra paper pads, pager, books, cough drops, snacks, water, extra box of gloves, deodorant, mouthwash, boot polish, boot brush… and a ton of bric-a-brac that comes in handy every once in a while.