500#9 Single Window Security Envelopes, Thick Gummed Seal, Designed for Secure Mailing of Payroll Checks, QuickBooks Invoices, Return Mail, and Business Statements - 3 7/8 x 8 7/8 — Open-Box, 30% Off

No. 9 Window Envelopes Designed For Check and Invoice Runs – Businesses and accounting teams processing payroll and vendor payments use these #9 single window envelopes measuring 3 7/8 x 8 7/8 inches, which fit standard business checks for consistent mailing during accounts payable workflows. Security Envelopes #9 Confidential Privacy Tint – Offices mailing checks and financial documents use these one window #9 security envelopes with a patterned interior tint that helps reduce read-through, protecting payroll details, vendor payments, and sensitive information during transit. Single Window Alignment – Accounting teams and small businesses requiring payroll envelopes with window use these #9 single window envelopes designed to align with printed check layouts, allowing payee addresses to display clearly without labels or manual adjustments. Reliable Gummed Flap Seal – Mailrooms and office staff handling high-volume check runs use these envelopes with a moisture-activated gummed flap that creates a secure seal for payroll batches and recurring accounts payable mailings. Bulk 500 Count Supply of Window Envelopes #9 – Businesses, payroll teams, and administrative offices use this 500-count pack of number 9 window envelopes to maintain a dependable supply for ongoing check runs, vendor payments, and routine financial mailing tasks.

Save time and money sending business mail with our number 9 Single Window Security Envelopes

Quickly and easily send hundreds of business invoices, bill statements, and checks with our number 9 envelope design and cost-effective gummed seal.

Our gummed flap with thick adhesive makes for quick and easy mass mailings.

Saves you money on bulk business mailing of business statements, invoices, or checks

Works great as a return envelope, so you can get paid faster

Business mail will be completely secure during transit

It can be so difficult to find envelopes that create a strong lasting seal thus forcing you to waste time using glue sticks or tape to close the envelopes. Our #9 single window envelopes with strong adhesives are designed to immediately create a strong seal so you do not have to worry about your contents being exposed to others.

Unlike weak sealing envelopes that allow your contents to fall out and become exposed; so much for a security envelope. Our strong seal will guarantee the safety of your contents.

It can be frustrating to purchase envelopes only to find them flimsy enough to have you worried about their durability during transit. Our envelopes are made of 24 LB White wove paper that will provide a professional look from the box all the way to your destination.