Why are some envelopes referred to as numbers, like a #10, or 6-3/4?

Why are some envelopes referred to as numbers, like a #10, or 6-3/4?

Those are terms used within the envelope industry and are common sizes. Use our simple envelope chart to see the common industry sizes and what the dimensions are for each size.

Why are some envelopes referred to as numbers, like a #10, or 6-3/4?

 

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