Shop All – Double Window Envelope, 8 5/8 X 3 5/8. This envelope is perfect for mailing invoices or statements. The double window design allows for easy visibility of the recipient’s and sender’s addresses. Made from high-quality paper, these envelopes are durable and secure. Available in quantities of 200, 250, 500, 1000, 1500, 2000, 3000, 4000, and 5000, making them suitable for both small businesses and larger organizations. Save time and effort by using these envelopes for all your mailing needs, ensuring a professional and polished appearance every time.