Use this "First Class Mail" offset window envelope to mail any tax return or report with software compatible or custom slip sheets. A blue interior tint adds security while the cellophane window allows the names and addresses to clearly show through. This 9 1/2" x 12 x 1" envelope is constructed of 28lb paper and accommodates documents up to 1". Expansion envelope has a sleeve to hold slip sheet in place.
Non-Expandable options available in Peel and Close: 80015PS or Moisture Seal: 80015
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