Let them be the makers of their own destinies, without having to worry they'll lose it all when you're not looking. Attach it to a gear loop of any sort, or wear it like a chain wallet - connected to your belt - and that bag o' money will be kept safe.
And their adults too. This baby has been tested by humans ages 6 through 45 - it fits nicely into a back pocket and stays secure thrown into any bag. It's lightweight, perfectly structured and holds up surprisingly well to dirt.