Milk being supplied in  glass bottles then  and in tetra pack now because tetra pack is Eco-friendly Aseptic and they keep the milk safe and fresh for monthes together.
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Selling of milk first in glass bolltles ,then in packets,then in tetra packs and vending machines indicates how over the years of mean of packaging have changed . this is done soo as to reduce cost or improve the goodwill by innovating the mode of packaging. for instance tetra pack keeps the milk safe and fresh for months and also it is made of paper which can be in turn recyled.this is also done to make the product more eco friendly.....  HOPE IT HELPED ....

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