(57) @ This invention concerns a two-way envelope having a front and rear surface formed
of a single rectangular sheet folded upon itself about a transverse central foldline.
The envelope comprises overlying front and rear return envelope panels, overlying
front and rear data bearing panels, and front and rear transverse lines of separation
parallel to the central transverse foldline and separating the return envelope panels
from the data bearing panels. The transverse lines of separation are offset to define
on one surface of the envelope a return envelope flap adjoining one of the return
envelope panels by a line of weakness. Adhesive is disposed on the inner surface of
the return envelope flap, and sealing means secures the three free edges of the two-way
envelope , about the central foldline except those portions of the edges coincident
with the return envelope flap.
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