Why a Small Window Can Add So Much Cost
A plain paper envelope is made from a sheet that is cut, folded, and sealed. Adding a transparent window changes that simple sequence: a section of the paper must be cut away, a plastic film placed over the opening, and the film secured before the envelope is finished.
The window itself uses little material, but it requires extra handling and an additional assembly step. The film also has to sit in the right position and stay attached, so the windowed version is not merely the same envelope with a small patch of plastic added. It is a more involved product to manufacture.
The Cost of an Extra Step
On an inexpensive item, even a modest addition can have an outsized effect on the production cost. Paper, cutting, and folding are already part of making the envelope; the window brings another material and another operation into the process. Those costs recur for every unit, whether the window is large or small.
That helps explain how a window can make production cost roughly twice as much as producing an envelope without one. The difference is not the price of a scrap of plastic alone. It is the combined cost of preparing the opening, adding and securing the film, and handling a more complex envelope.
The tradeoff is practical: the window lets an address show through without printing it directly on the envelope, but that convenience starts on the factory floor—with an extra piece and an extra step.
