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Jiffy bag

noun
  1. trademark a thickly padded but light envelope in which articles such as books are placed for protection in the post
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012