The main thing that I don't see are some water-purification tablets.

Also, if you already carry a FAK on the belt, do you need more bandages and FA-cream in your PSK? If you would remove them, you could fit some HD aluminium foil in there.

Another thing you could fit in there is a magnifying-glass.

I assume you carry some form of shelter on your person?

Nice PSK!!
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''It's time for Plan B...'' ''We have a Plan B?'' ''No, but it's time for one.'' -Stargate SG-1