Hi, I thought about a little addition in the line of first aid supplies in a PSK: a 3M Tempa-dot flexible disposable thermometer. I don't think having a thermometer is so crucial but it takes absolutely no room because it's flat and I packed one in an altoids tin and it fits nicely:

http://www.vimpex.com/tempadot.htm

But the drawback is that they have a short shelf live (mine is good until september 2006) and they shouldn't be exposed to temperatures greater than 95°F (35°C)

Frankie