#9 Window Envelopes
#9 Window Envelopes (3 7/8" x 8 7/8") provide extra space for return documents while maintaining a professional appearance. Commonly used for payments, order forms, surveys, and fundraising mailings, these envelopes fit neatly inside #10 outer envelopes for easy return mailing. Custom printing options allow you to include instructions, branding, and response fields directly on the envelope.
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