: Two windows show both the return address and the recipient's address; commonly used for checks. Recommended Purchase Options Choose based on your volume and specific security needs: High-Volume Business Essentials Staples Self Seal Security Tinted Window Envelopes Go to product viewer dialog for this item. Jam Paper Business Commercial Window Envelopes Go to product viewer dialog for this item.

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: The 4 1/8" x 9 1/2" business staple for letters and invoices.

💡 For professional look and efficiency, "Peel & Seal" (like those from Staples ) is generally preferred over "Gummed" flaps to avoid the mess of moistening.

Office Depot Security Envelopes Left Window Clean Seal White Box of 250 Walmart - Office Depot LLC Go to product viewer dialog for this item.

Window envelopes streamline business mail by showing recipient addresses directly through a transparent film. This eliminates the need for separate labels or hand-addressing, which is ideal for invoices, checks, and statements. Key Types of Window Envelopes

Double Window Security Check Envelopes Gummed Flap Designed for QuickB Businessenvelopes.com Go to product viewer dialog for this item. Bulk & Niche Sizes

: Features a strip that seals instantly without moisture.