Flexible food packaging for cereals is every bit as good as the traditional box packaging. Boxes protect cereals from the sunlight, moisture, and oxygen. Flexible pouches perform these functions equally well, and at a lower price.
A stand up bag is made from aluminum foil, polypropylene, and polyesters. The layers of these materials are heat sealed to create suitable packaging to safeguard cereals.
The water vapors that are present in the atmosphere accelerate the growth of enzymes, fungi, and other organisms that spoil cereals. Bad odors picked during transportation render cereals unfit for consumption. The slightest contact with dirt fills a pouch of cereals with bacteria. The ultraviolet (UV) light from the sun can break carbohydrates and other large molecules in cereals. Stand up pouches make an effective guard against all of these issues.
Insects are another enemy of cereals. Boxes of wood or metal are impregnable for most insects. Stand up pouches can be made insect proof by introducing puncture resistant barrier films and other tough materials in the structure of pouches. To include a few layers of these tough materials in pouch bags is less expensive than going for a full-fledged box of metal. Yet, the results are equally awesome.