Everyone's needs will be different. Below is my small pocket survival kit and the other items I routinely carry when I am out in the field. I do add and subtract items based on where and when I am going, but this is the basic foundation of my kit.

This kit is carried in a simple orange pack-cloth pouch made by
Survival Kit Solutions (seen below) and contains:
Along with this kit, I typically carry:

All of these items are spread throughout my pockets and/or belt. Items that I find myself using in the field a lot are duplicated (knife, flashlight, whistle and signal mirror). I also always have a small notebook and pen of some kind in my pocket and often I have a lighter with me as well.