| 摘要 |
A rectangular envelope formed from a single sheet of paper has a front panel with a window and foldable flaps on each edge. A first enclosure in the envelope has an address visible through the window and three of the flaps hold the enclosure in place and are loosely held in place while the fourth flap overlies the other three and is temporarily adhered, for mailing. For return mailing, after the first enclosure has been removed, the fourth flap is folded against the front panel and a return address on the fourth flap is visible through the window. A second enclosure is placed against the fourth flap and the other three flaps are folded to enclose it and the outer one of them is then permanently adhered to an edge of the fourth flap to close the envelope for return mailing.
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