some drinks (like coke) are packaged in aluminium cans, plastic bottles and glass bottles – why are there three different types of containers instead of just one?
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Because it was put in glass bottles when that’s all that existed, then put in aluminum cans when they came along because that was cheaper, and then plastic bottles.
But some people find more value in the older packaging, and aluminum can be bulk packed easier — so cans have their place, as do bottles, and some people are willing to pay more for glass for nostalgic or environmental reasons.
Money/cost of course.
Aesthetics.
Glass is heavy and fragile, metal and plastic are much less easy to break.
Plastic is often porous/permeable. Air can pass through (molecule by molecule) and change the quality of the contents. Glass and metal are more resistant.
Metal corrodes. tomato acid will eat a hole in the can.
So in practice it’s usually a combination. Plastic lined cans. Metal lined pouches, like juice boxes.
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