Huh? <tao54nyc>, Do you have some definition of the word "bag" that the rest of us are unaware of? I checked several dictionaries, both online and my trusty Oxford - 'the' definitive dictionary of the English Language. None of them say that a bag is only made from paper (hence the phrase "a paper bag", to specify that it's not cloth or other material). I am not going to type in what's in the paper dictionary, but here's a definition from dictionary.com, which is a pretty good source:
1. a container or receptacle of leather, plastic, cloth, paper, etc., capable of being closed at the mouth; pouch.
2. something resembling or suggesting such a receptacle.
3. a suitcase or other portable container for carrying articles, as in traveling.