This #9 double-window envelope is ideal for securely mailing standard business letters and invoices. Specifically sized at 8 7/8″ x 3 7/8″, it features two clear windows for easy visibility of sender and recipient addresses, eliminating the need for manual labeling. Crafted from opaque paper with a security tint, it helps protect sensitive information during transit while maintaining a clean, professional appearance—perfect for everyday business correspondence.
Top window: 4″x1″; 3/8″ from left, 2 1/4″ from bottom
Bottom window: 4″x1″; 3/8″ from left; 1/2″ from bottom