Start a new holiday tradition by recycling paper grocery bags into U.S. post office approved mailing envelopes. A talented artist named Liesl gives you easy step-by-step instructions (plus photographs) to walk you through the process in the link below.
http://lieslmade.wordpress.com/2011/06/03/paper-bag-mailer-tutorial/
Think Outside The Bin
Think Outside The Bin 
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Great Post!!! After reading your post we can reuse envelope by many different ways and make a book of mailing envelopes. I love these so much.