Nice kit. I like the simplicity.

When I did this for Scout years ago we found low cost fanny packs at orientaltrading.com that worked well.

Same site also had cheap whistles on sproingy wrist bands by the dozen. Not Fox 40s, but were plenty loud.

I like the bright orange switched LED keychain lights that countycom.com has. No blinking mode, but I'm OK with that. BTW, personally I'd have them save the battery on the light and tell them not to use it - not even in a blinking mode - unless scared and "just checking" or if they hear searchers calling for them.

The hardest part to find seemed to be the orange bags.

The toughest part of the whole thing is to get the kids to carry the kits.