--- product_id: 37086617 title: "Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal" brand: "blue summit supplies" price: "€ 85.17" currency: EUR in_stock: true reviews_count: 11 category: "Blue Summit Supplies" url: https://www.desertcart.pt/products/37086617-blue-summit-supplies-500-9-double-window-security-envelopes-self store_origin: PT region: Portugal --- # Peel & Seal fast closure 3.8 x 8.8 inches perfect fit Security tint for privacy Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal **Brand:** blue summit supplies **Price:** € 85.17 **Availability:** βœ… In Stock ## Summary > πŸ“¬ Elevate your invoicing game with secure, sleek, and speedy mailouts! ## Quick Answers - **What is this?** Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal by blue summit supplies - **How much does it cost?** € 85.17 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/37086617-blue-summit-supplies-500-9-double-window-security-envelopes-self) ## Best For - blue summit supplies enthusiasts ## Why This Product - Trusted blue summit supplies brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Bulk Ready:** 500-count pack keeps your office stocked for uninterrupted, high-volume invoice runs. - β€’ **Effortless Sealing:** Peel-and-seal strip ensures quick, moisture-free closureβ€”boosting your mailing efficiency. - β€’ **Optimized for QuickBooks:** Specifically sized to fit QuickBooks invoices and statements, streamlining your billing workflow. - β€’ **Confidentiality Guaranteed:** Security tint blocks prying eyes, protecting sensitive financial info in transit. - β€’ **Precision Alignment Windows:** Double window design perfectly aligns addresses for seamless, label-free mailing. ## Overview Blue Summit Supplies 500#9 Double Window Security Envelopes are designed for professional invoicing and billing workflows. Featuring two aligned windows for address accuracy, a privacy tint to protect sensitive data, and a peel-and-seal closure for fast, secure sealing, these 3.8 x 8.8 inch envelopes come in a convenient 500-count pack. Ideal for businesses and accounting teams using QuickBooks, they eliminate the need for labels and manual addressing, saving time while maintaining a polished, confidential mailing presentation. ## Description desertcart.com : Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal | 3 7/8 x 8 7/8 in, Security Tint, Peel and Seal, for QuickBooks Invoices, Statements, Confidential Billing Mailings : Office Products Review: Professional look and great time saver - This is a great product and at a very reasonable price. As a small membership-based nonprofit we send out an acknowledgement for every donation received. Having a quality #9 double window self seal security envelope has eliminated the need for hand addressing or generating mailing labels. Our logo and up to 4-line addressing fit the windows perfectly. The benefit of all the time saved and the professional look easily justifies the cost of the product. Review: Self sealing envelopes - They are great ## Features - No. 9 Envelopes, Self Seal, Designed For QuickBooks Invoices – Businesses and accounting teams mailing invoices and statements use these #9 double window self seal envelopes designed to reveal and align return and recipient addresses for accurate billing without labels or manual addressing. - Self Sealing No. 9 Double Window Envelopes with Fast Peel & Seal Closure – Offices and billing teams handling high-volume invoicing use these #9 self seal security envelopes with a peel-and-seal strip that creates a secure closure quickly without moisture, improving efficiency in accounts receivable workflows. - Number 9 Double Window Envelopes with Privacy Tint – Businesses mailing financial documents use these two windowed #9 envelopes made from 24lb white paper with a printed security tint that helps reduce read-through and protect sensitive information during transit. - Room For Statement Inserts – Offices, tax professionals, and nonprofits use these 2 window #9 envelopes measuring 3 7/8 x 8 7/8 inches, which support invoices plus additional pages such as inserts or return envelopes for structured mailing workflows. - 500-Count Office Supply Pack – Small businesses, accounting teams, and administrative offices use this 500-count pack of #9 double window envelopes to maintain a dependable supply for recurring invoice runs and monthly statement processing. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01M5HR1N3 | | Additional Features | Double Window, Peel and Seal, Security Tint, Self-Adhesive Closure | | Best Sellers Rank | #38,719 in Office Products ( See Top 100 in Office Products ) #114 in Business Mailing Envelopes | | Brand | Blue Summit Supplies | | Brand Name | Blue Summit Supplies | | Closure Type | PEEL & SEAL | | Color | White | | Customer Reviews | 4.6 out of 5 stars 614 Reviews | | Item Dimensions L x W | 8.8"L x 3.8"W | | Item Shape | Rectangular | | Manufacturer | Blue Summit Supplies | | Material | Paper | | Material Type | Paper | | Number of Items | 1 | | Occasion | Business Mail, Invoicing | | Occasion Type | Business Mail, Invoices | | Recommended Uses For Product | Security | | Size | Number 9 | | Style | Security | | UPC | 865181000306 | | Unit Count | 500 Count | ## Product Details - **Brand:** Blue Summit Supplies - **Closure Type:** Self-Seal - **Color:** White - **Material:** Paper - **Occasion:** Business Mail, Invoicing ## Images ![Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal - Image 1](https://m.media-amazon.com/images/I/71y19OQM3TL.jpg) ![Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal - Image 2](https://m.media-amazon.com/images/I/81el1PGXvmL.jpg) ![Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal - Image 3](https://m.media-amazon.com/images/I/81Qo+htIGGL.jpg) ![Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal - Image 4](https://m.media-amazon.com/images/I/81Aw9CK4TtL.jpg) ![Blue Summit Supplies 500#9 Double Window Security Envelopes, Self Seal - Image 5](https://m.media-amazon.com/images/I/71ki4kyd+gL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Professional look and great time saver *by B***T on February 4, 2017* This is a great product and at a very reasonable price. As a small membership-based nonprofit we send out an acknowledgement for every donation received. Having a quality #9 double window self seal security envelope has eliminated the need for hand addressing or generating mailing labels. Our logo and up to 4-line addressing fit the windows perfectly. The benefit of all the time saved and the professional look easily justifies the cost of the product. ### ⭐⭐⭐⭐⭐ Self sealing envelopes *by J***J on April 10, 2026* They are great ### ⭐⭐⭐⭐⭐ Works for QuickBooks Invoices and statements. *by A***R on June 9, 2024* Self adhesive envelopes that work good for QuickBooks invoices and statements. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.pt/products/37086617-blue-summit-supplies-500-9-double-window-security-envelopes-self](https://www.desertcart.pt/products/37086617-blue-summit-supplies-500-9-double-window-security-envelopes-self) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-11-12*