Which properties of glass are useful for packaging and storing food and drinks?

Glass has numerous advantages for use in packaging food and drink. Glass is a safe material because it is nonporous and impermeable; this means that the packaging and the contents have no interaction, even when heated. In turn, the absence of interaction means that the product’s flavor is not affected, and the food will keep its strength and aroma. Glass is transparent so that the potential consumer can see the contents. Glass also withstands the high temperatures needed for processing. Another advantage of glass is that it is recyclable. Not only does this help keep glass out of landfills and reduce the need for raw materials, it also means that old glass can quickly be turned into new glass, which is just as high quality as the previous container. The product can also be heated in a microwave without being transferred to another container.
http://www.gpi.org/learn-about-glass/benefits-glass-packaging