About the only thing I could really see being different for location is maps, clothing, and a book on edible plants for your region.
Also, bags are definitely going to vary from person to person depending on their skill set and how many they are preparing for.
Best way I have found is take the standards: shelter, fire, food, water, clothing, defense, cordage, TP, medical, and lay them out. Now take everything in the backyard and survive a night. Go inside and grab what you forgot.
Now drag this pack out the forest and live a night in it. Go home and what you did not need besides the obvious medical kit remove.