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The number of sheets of paper that can fit in a 6 inch by 9 inch envelope depends on the thickness of the paper. Standard printer paper is about 0.1 mm thick. If we assume a typical thickness, you could fit approximately 20 to 30 sheets comfortably, but this can vary based on the type of paper and how tightly you pack the envelope.
A letter (a sheet of paper in an envelope).
For flat paper items, postage goes by weight, not by size.
Not all paper has the same thickness or size, but if you are using the most usual type of paper, you can mail four sheets with one regular stamp.
Over 9000.