#9 envelopes are suitable for business or personal mailing needs. Shop 3 7/8" x 8 7/8" envelopes in various styles, including window and self seal.

EnDoc 500#9 Double Window Envelopes Self Seal, 3 7/8 x 8 7/8" Security Tinted Envelopes for Invoices & Statements, Business Mailing Envelopes with Windows, Bright White 24lb Paper no. 9

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#9 Envelopes One of the most popular envelope sizes in business with many uses, including sending invoices and correspondence.

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May 20, 2025 · Read our detailed guide on What is the difference between a #9 Regular envelope and a #9 Remittance envelope? to quickly resolve your issues and understand key features.