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Mail invoices, payments, newsletters and other correspondence to customers, clients, vendors, and employees. Self-sealing and window envelopes make mailing quick and easy. Shop single and double-window envelopes. Order pre-printed envelopes with your return mailing address for added convenience. Browse our complete collection of business envelopes and choose the right solution for all of your company's needs. Save on an assortment of tax form envelopes, too.