In my bag I have pens and pencils, spare eneloop batteries for my GPSr and camera, my camera and water. The only other thing I carry is, of course, my GPSr. I plan to add things like spare plastic bags and stuff for cache maintenance in the future, though.
I don't carry a mobile phone or radio or anything with me when I'm out. I like it that way. Doesn't feel like I'm really "out" if I'm carrying a phone.