Packaging and package labeling have several objectives Physical protection - The objects enclosed in the package may require protection from, among other things, mechanical shock, vibration, electrostatic discharge, compression, temperature, etc. Barrier protection - A barrier from oxygen, water vapor, dust, etc., is often required. Permeation is a critical factor in design. Some packages contain desiccants or Oxygen absorbers to help extend shelf life. Modified atmospheres  or controlled atmospheres are also maintained in some food packages. Keeping the contents clean, fresh, sterile and...