Here’s a neat little post by the FirePIO: http://thefirepio.com/2010/10/18/what%E2%80%99s-in-your-pio-or-pao-%E2%80%9Cgo-to%E2%80%9D-bag/
I carry around a little preparedness pack just about everywhere, but it’s got general prep stuff like a flashlight, whistle, emergency id, batteries, markers. I hadn’t considered carrying stuff for PIO functions. I usually have a camera and notebook, but I appreciate the scope and thoughtfulness that Jeff underwent in compiling this list.
He’s got lots of recording devices (pens, papers, video and still cameras and voice recorders) and identification materials (PIO armbands and, in previous versions of this list, hats). I’ll have to consider if any of this stuff fits into my lifestyle.