Great kit! Now use it: at some mid point on your hikes, stop, and deploy the kit or some part of it with your Cub Scouts. Get them familiar with the kit and its contents, and what its good for. If you have a big red garbage bag, fill it with leaves and crawl inside for warmth, or make holes and put it over one of the Scouts for rain protection. And so on. Don't let your kit be a mystery to young Scouts, the big bag that Dad carts along Just In Case - you'll want them to know what you have, and be able to ask you to deploy things, or deploy them on their own.

Also, they are old enough to learn a few tricks to minimize the risks that come with hiking, so make sure to teach them some good habits (which are deeply embedded in Scout adventuring anyway). If they learn them now, its even less likely you'll have to deploy your kit in the future.

Team up - use the buddy system on every hike. Its way, way more difficult for 2 Scouts to get lost together.

Second, slowest hiker in front - no one racing ahead, chasing deer, getting off trail, getting easily lost. Its best to have a more mature younger hiker immediately behind the slowest hiker to help manage and buttress the slowest hiker versus others who just want to go fast. Resist the go fast mentality, your Scouts will get spread out too quickly.

Third, Keep together - I think its important to keep young hikers in sight at all times, a train of hikers spreading miles ahead of you is just looking for trouble. The only exception is when you have some older mature hikers who can hike ahead with a knot of hikers, and one who can dawdle along with the second, slower group. This is a "rule" that you can adjust to circumstances, responsibility and ages of your hikers.

Third, you or another adults should be in sweeper position - last hiker. No one falls behind you, no one gets left behind.