The first answer is, if your pack is UL, why would you ever be separated from it? About the only time would be if you wandered away from camp and darkness fell or you got disoriented.
So, I admit it. I've done that. Went to a remote spring and got turned around in the high, thick brush between the spring and my camp. It happens and it's a very nasty feeling. On the other hand, I don't expect to ever be separated for more than a few hours.
I had on Crocks, running shorts, a watch and a "survival" neckless. I keep a compass on the watch band, and it's the only compass I use, so I know how to use it. The neckless is a breakaway lanyard with a squeeze light, a whistle, a small butane lighter, and a SAK. I use it like a pocket to hold everyday items. That way, it doesn't get left somewhere and I know everything works all the time.
How did I find camp? I was alone, so the whistle was uselsss. I knew I had to go uphill, but I also knew I could cut the trail to the spring. I missed the trail somehow in the thick brush and darkness, so I worked a star pattern using the compass to return to the spring and the LED for light. It took several tries until the reflectorized patches on my tarp showed me the way home.
My feeling is that if my "survival kit" had been larger than this, I would have left if at camp.