A 72 hour bug out bag (BOB) is just that – a bag that has been stocked with enough supplies to keep you alive and healthy for 72 hours.
The 72 hours is significant, because that will either give you enough time to get yourself to a safer, better supplied location, or whatever situation caused your need to survive will hopefully have passed by then. In a best case scenario, each person in your group (family) will have their own BOB.
A BOB can be any type of military, hunting, or hiking style bag. You want it to be comfortable and sturdy, preferably with a waist strap to help keep the weight off your shoulders if you have to walk a long distance. You can get a quality bag at your local military surplus store, any Bass Pro Shops, Cabela’s, or Dick’s Sporting Goods.