The first thing that popped into my head was either you are planning a 200 mile bug out on roads or you are bugging out with 8 kids.

Me, family of 4, 60 mile bug out. Medium alice, and everyone else with daypack.

How far is your destination, and over what terrain?

Shelter
Fire
Water
Clothes/Bag

all I consider critical and would make sure I have them in my pack. What is filling the large alice?