identification for kids, moneybelts, etc

We are travelling/backpacking with 2 children (9 and 11) to asia for 5 months. I am looking for ideas for them carrying there own identification (copies of passports etc). I'm not sure that the money belt will be a succes, maybe something, pouch, around the neck. Any suggestions from similar travel experiences would be appreciated.

Our younger kids (3-7 years) wore a little bag we picked up at a stall somewhere in the shape of a funky elephant or ghecko or whatever they chose - inside was a card with their name and our guesthouse. Had we been carrying a mobile phone, that number would have been very useful too. Older kids (9-15) carried a similar card in their back pocket - they did not have their names on the cards;-)