Hi,
I wouldn't give them an Altoids-sized tin. It's way too small and the items you're going to be putting in there will be hard to use for kids.
I would have a tendency to give them a cheap camera bag stuffed with a poncho, a cheap space blanket, a flashlight, Band-aids, a whistle. Make sure they carry at all times, along with a hat on their heads and a water bottle.
Two kids camping together along with an adult probably doesn't require carrying P-38s and sewing needles (by the kids, at least! <img src="/images/graemlins/grin.gif" alt="" />
Just my opinion.
Bee
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"The only easy day was yesterday."