An envelope that has a long rectangular closure flap across the long edge of the envelope.
An envelope that opens on the short edge.
C4 or C5 size envelope that opens on the long edge for ease of inserting documents; can be Plain Face or Window Face.
An envelope that has a triangular closure flap on the long edge.
Where a dry substance along one edge of the closing flap, when moistened and pressed shut, seals the envelope.
Where a covering strip is placed over the sealing substance on the flap. Once peeled back and the envelope is pressed shut it is sealed.
An envelope that has no window.
Where an envelope has two flaps for closing. A sealing substance on each flap, when pressed together seals the envelope shut.
An envelope that has an address window.