While surfing I found Red Fox safety & survivor products .

Their Safety & Survivor I seems to fit doug's "1 person pouch" category:
from the site:
Only 20oz. and 9-1/2" x 5" x 2-1/2"
Heavy duty belt loops.
Can be carried comfortably on your belt or easily placed in a fanny pack!

see http://www.redfoxsafety.com/survivor1.htm

You can also buy the components seperately.