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The most obvious and straightforward answer to this question is a very simple one - a plastic bag is a bag made out of plastic. Of course you knew that already and, whilst factually correct, this answer doesn't fully go into any detail about what makes a plastic bag, apart from plastic. The more helpful answer is actually a little more complicated than some people might think.
UkPolytheneBags.co.uk - the home of polythene bags in the UK