Window Envelopes for Professional & Efficient Business Mailings

Window envelopes streamline business mailings by eliminating the need for handwritten or printed labels. Designed for invoices, checks, and other important documents, these envelopes offer a polished and professional look while ensuring accuracy in delivery. At Advanced Filing Concepts, we offer a full selection of single window envelopes and double window envelopes in bulk boxes of 500—perfect for high-volume business use. Our envelopes come in standard #9 and #10 sizes, as well as many other sizes, designed to fit most standard business documents. Choose from self-seal, security-tinted, and custom-printed options to match your needs.