I was wondering if having emergency food bars in my BoB would be a good idea to help save space and weight. Or should I have it along with a MRE or two?

In the first hours/days of an emergency situation, using your stockpile of food may not be a practical/possible thing to do. It might be hard to cook, you might be in shock or injured, etc. To prepare for just such an instance, we have bought a few cases of 1200 and 2400 calorie emergency food...