In survival situations, one 500g pack provides enough nutrition to last one person 72 hours. Ration requires no preparation and may be eaten directly from the box. Each 500g gives 10,300 kJ or 2,500 kcal and contains the highest possible ratio of balanced nutrition compared to volume. Each package of SOS (500 g net) contains 18 tablets packed in 9 bars with grease-proof paper.