It looks pretty good. Only one or two "huh"s.

Thoughts:

Double bag the kit- gives them a spare bag for water, and helps protect everything. Triple bagging would be good, would generally be seen as obsessive.

Swap the bullion cubes for ramen seasoning packs- if you do you get water in the kit, you don't get beefy smelling gear. The smell never gets out.

Ditch the slingshot- yes you can get food. But you have to be pretty dang good to get more with the slingshot than you will the fishhooks.

Do they drink tea? If not, maybe some sugar packets.

A couple of zipties.

If the pouches are of the variety that have the little eyelet tab at the top for attaching suspenders, put a split ring on it, and attach a mini biner, and put a couple of spare split rings on it so they can move the whistle, light, whatever they like out to that point so they can reach it without digging.