It looks like you have covered the basics.
Quote:
I want to give a brief talk on being prepared and what they should carry.
A few Q's come to mind:
How long before the hike will you be giving this talk? Will the kids be able to change the stuff they're carrying? If you give the talk just before you start walking it may be too late to change what's in their pack. If you give it after you've left for the overnight it will be difficult to change out those cotton socks for wool or to grab a sweater they thought wouldn't be needed.

Have subjects like navigation already been taught at the Webelo level, or is the knowledge about how to use a compass and map a prerequisite for the hike? Knowing how to use a map and compass is easier said. . .

It's been a long time since I was in the scouts.
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Better is the Enemy of Good Enough.
Okay, what’s your point??