Great kit:
agree on the flashlight inst. but perhaps that could
be covered with a demonstration when you hand out the kit.

One item I would consider added or perhaps replacing is the
florescent tape, you need more of it.
Replace it with a survey roll 150ft in the kit.
If someone gets lost teach them to tie off one end of the roll
and unroll the entire 150ft. in a line across a terrain feature, trail, uphill, a line away from a creek etc.
then tie the end to there belt or tree they are hugging. By doing this
someone will be sure to cross the line during a search and follow it
to the "camper". Survey tape work 24/7 used in this manner.

You have no idea how often a searcher will come close and pass a target without seeing them. This happens for many reasons, a sleeper, fright, hidden in a shelter etc. etc. its easier than you think.