I currently am gathering/creating several different "layers" of a BOB. A large one that can take two people to carry (footlocker sized) where I can throw in the back of the truck an go if time warrants, Plus the Zombie killers (M4/Long range Black rifle/AR pistols) It includes 3 days of food for the family with some luxuries (soap, 1K ammo, some extra water, water purification stuff/and advanced first aid.).

Plus I am gathering a personal BOB for each person like ones you are gathering 10-15 lbs for the little ones, and 40 lbs for the adults. handy in each bedroom for quick grab. They each compliment the large BO"Box" and provide a layered approach to supplies. I also always keep various supplies like extra tools/oil and other consumables in my truck for a long road trip.

Don't forget where you are going to bug out to. Gotta have a plan... ;-)