According to Wikipedia, a bug-out bag designed for evacuations typically include the following:

CASH, plastic tarp, Proper Identification, duct tape, rope, Food and water (at least one gallon per day) for 72 hours for each person, adequate medications, cooking utensils, tent, map, firearms, knives, roll of wire for trapping and securing items, compass, maps, proper clothing, sleeping bag, fire starting tools, first aid kit, battery or crank operated radio/2 way radio, lighting, water purification system and more. See the full list here and then below, get a Bug-Out Bag Kit or build your own.