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Physical protection is required for food stored in packaging bags to avoid squeezing, impact, vibration, temperature difference, and other phenomena. The protective shell can isolate food from oxygen, water vapor, stains, etc., and leakage prevention is also a necessary element in packaging design. Some packaging includes desiccants or deoxidizers to extend the shelf life.

Vacuum packaging or removing air from packaging bags is also the primary method of food packaging. Keeping food clean, fresh, and safe during its shelf life is the primary function of packaging bags. Encapsulating or stuffing small items of the same variety into the same packaging is a good way to save volume. Powder and granular objects require encapsulation.

Communicate information on packaging and labeling to inform people about how packaging or food is used, transported, retrieved, or disposed of. Marketing often uses packaging box labels to encourage potential buyers to purchase goods. Packaging design has become a insignificant and constantly changing phenomenon for decades. Marketing communication and graphic design should be applied to the highlights of packaging boxes and (for some reasons) sales displays.

Packaging can play an important role in reducing transportation safety risks. Packaging bags can also prevent food from being included in other products. Food packaging can also reduce the likelihood of food being stolen. Some food packaging is strong and has anti-counterfeiting labels to protect the interests of merchants from loss. The packaging bag can have laser identification, special colors, SMS authentication and other labels. Other retailers have electronic surveillance labels on food packaging bags to prevent theft, waiting for customers to obtain the store's exit for demagnetization.

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