plastic is cheaply available..
Plastic is less dense than glass, so normally a plastic cup is considerably lighter than a glass cup, although in theory a very small glass cup could weigh less than a very large plastic cup.
Because the plastic containers WEIGH less than glass.
Glass is typically smoother than plastic due to its non-porous surface and molecular structure. Glass is also less likely to accumulate scratches or imperfections compared to plastic, leading to a smoother feel.
Plastic skylights weigh less than glass and can be replaced easier. Using plastic instead of glass lowers the fabrication price and allows for more recycled items to be used in its construction.
Generally, glass is more dense than water. (There are some types of glass which are less dense.) You can demonstrate this by gently placing a glass full of water in the sink or tub; the glass will sink, indicating that glass is more dense than water. If the glass were to float, we would know that the glass were less dense. Try this with plastic cup; the plastic is normally less dense, and will float.
I found a company that makes a few different products for glass and Plastic.They are Janvil. Their site is janvil.com . They have glass scratch removers for glass scratches and plastic polish
Glass is a better insulator than plastic. Plastic is used on wire for insulation purposes because of its flexibility, where as glass is not. Glass is used as insulators for holding wires to cross arms on power poles as plastic would not stand up to the weather year after year.
Using frames with plastic instead of glass offers benefits such as being lighter, more durable, and less prone to shattering. Additionally, plastic frames are often more affordable and can provide a wider range of design options.
Because a glass thermometer has a liquid inside (alcohol or mercury), that can poison you if it brakes.
Glass bottles break, and then you've got milk all over and broken glass to deal with.A plastic bag weighs less (cheaper to transport), is less likely to break, and even if it does then there's just the milk and a piece of harmless soft plastic.Now: the question of "why plastic bags instead of plastic bottles" is most likely because you live in America's Hat, Canada. I really don't know why they made this bizarre choice.
Plastic cocktail shakers are lighter, more durable, and less likely to break than glass or metal ones. They are also more affordable and easier to clean.
Glass would be healthier