An MRE (Meal Ready to Eat) has a variety of things inside, from vacuum sealed Spaghetti, to a pouch of soup. It also contains packaged juice, or water. Lastly there's usually a little treat inside, like freeze dried ice cream or a sweetie. In DayZ, MRE's spawn wherever you can find food, but with a very low drop rate. It restores as much blood as several different meats, Yet rabbit is still better. Its absurd model size is only for show, as it only takes up one inventory space.