Ration packs are perhaps one of first things that spring to mind when we think of food in the military. But have you ever stopped to consider how they're developed? From their weight to their ability to be dropped from high altitutudes and withstand boiling and freezing climates, the science behind ration packs is incredibly complex.

Ross Coad spent more than three decades working at the Defence Science and Technology Group in Scottsdale, Tasmania. This involved research on food packaging, food processing, the nutritional requirements of military personnel and, of course, ration packs.

Listen as he uncovers the best (and worse) ration pack items, and how they were trialled in the field.