One Square Meal can be eaten all at one time to replace a meal however, being conveniently packaged in two individually wrapped halves (each called an OSM bar) means there are lots of other options. One OSM bar can be eaten with other food to replace a meal eg. with a sandwich and fruit for lunch, or with a smoothie for breakfast. One OSM bar is also a great option when you need balanced food to sustain you between meals, or to take with you when exercising to top up your energy before, during or after exercise.
The inner packaging creates a barrier to prevent moisture, air or other volatile substances getting through to your OSM bar. This ensures it stays fresh and prevents it from picking up flavours or smells from anything else in the environment.