--- product_id: 1894281 title: "Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8\" x 8-7/8\", 24 lb White, 500/Box (QUA67529)" brand: "quality park" price: "Β£102.59" currency: GBP in_stock: true category: "Quality Park" url: https://www.desertcart.co.uk/products/1894281-quality-park-9-security-envelopes-double-window-tamper-evident-self store_origin: GB region: United Kingdom --- # 3.88" x 8.88" perfect fit Tamper-evident seal Reflex blue security tint Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) **Brand:** quality park **Price:** Β£102.59 **Availability:** βœ… In Stock ## Summary > πŸ“¬ Seal your success with confidence and style! ## Quick Answers - **What is this?** Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) by quality park - **How much does it cost?** Β£102.59 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/1894281-quality-park-9-security-envelopes-double-window-tamper-evident-self) ## Best For - quality park enthusiasts ## Why This Product - Trusted quality park brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Bulk Ready Supply:** 500 envelopes per boxβ€”never run out during critical billing cycles or mass mailings. - β€’ **Effortless Self-Seal:** Quick, aggressive seal mechanism for fast, reliable mailing without extra tools. - β€’ **Privacy-First Design:** Reflex blue interior tint blocks prying eyes, protecting sensitive client data. - β€’ **Double Window Precision:** Showcases sender & receiver info flawlessly, saving time and boosting professionalism. - β€’ **Tamper-Evident Security:** Patented Reveal-N-Seal closure instantly reveals any unauthorized access attempts. ## Overview Quality Park #9 Security Envelopes combine professional double window design with advanced tamper-evident self-seal technology and reflex blue security tinting. Sized at 3.88" x 8.88", these 24 lb white envelopes come in bulk packs of 500, ideal for secure, efficient mailing of invoices and statements while safeguarding sensitive information. ## Description Quality Park #9 Double Window Envelopes show the sender address and receiver address for billing invoices, business checks and other important statements. The ultimate in privacy and security, these Reveal-N-Seal security envelopes have a perforated tamper evident seal, plus a reflex blue pattern to protect sensitive information, even when envelopes are held up to light. Each self sealing envelope is made of 24 lb white wove paper with side seams for a professional appearance. Business envelopes seal closed by simply lifting the bottom flap up and pressing it to the top flap for a permanent seal. Available in boxes of 500 so you never run out! Envelope dimensions are 3 7/8 x 8 7/8 inches. Top window dimensions are 1 3/16 x 3 1/2 inches, 3/8 inches from the left and 2 inches from the bottom. Bottom window dimensions are 1 x 4 inches, 3/8 inch from the left and a 1/2 inch from the bottom. ## Features - CONVENIENT DOUBLE WINDOW: Display the sender and receiver addresses through the double window openings. Positioned to fit most invoice address layouts, this double window envelope not only saves time but also makes sure the document is delivered straight into the customer's hands! The 1-3/16" x 3-1/2" top window is positioned 3/8" from the left and 2" from the bottom. The 1" x 4" bottom window is positioned 3/8" from the left and 1/2" from the bottom. - ENHANCED PRIVACY FEATURES: Protect sensitive client information with these security tinted envelopes. The reflex blue pattern lining the envelope's interior makes it impossible to see the details of the contents, even when held up to the light. Mail invoices, statements and other important documents with confidence. - REVEAL-N-SEAL SELF SEAL CLOSURE: The best overall self-sealing envelope in the industry! It's patented seal design allows for an aggressive quick seal. Simply pull the bottom flap up, fold the top flap down and press to seal. A built-in security feature along the top of the flap shows indications of tampering. - 500 ENVELOPES IN EACH BOX: ideal for both everyday office use and bulk mailings, each box of Quality Park #9 Double Window Security Tinted Invoice and Statement Envelopes provides a long lasting supply! ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0013CKQ2Q | | Additional Features | Security Tint | | Best Sellers Rank | #102,565 in Office Products ( See Top 100 in Office Products ) #246 in Business Mailing Envelopes | | Brand Name | Quality Park | | Closure Type | Self-Seal | | Color | White | | Customer Reviews | 4.3 4.3 out of 5 stars (82) | | Global Trade Identification Number | 00085227675293, 50085227675298 | | Included Components | … | | Item Dimensions L x W | 8.88"L x 3.88"W | | Item Shape | Rectangular | | Item Type Name | Security Envelopes | | Item Weight | 4.54 g | | Manufacturer | TOPS Products | | Material Type | Paper | | Model Name | QUA67529 | | Number of Items | 1 | | Occasion | Business/Professional | | Recommended Uses For Product | Security | | Size | 3-7/8 x 8-7/9 | | Style | Security | | UPC | 085227675293 778888041018 666673164090 780411001413 | ## Product Details - **Brand:** Quality Park - **Closure Type:** Self-Seal - **Color:** White - **Material:** Paper - **Occasion:** Business/Professional ## Images ![Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) - Image 1](https://m.media-amazon.com/images/I/71vE3X+k7UL.jpg) ![Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) - Image 2](https://m.media-amazon.com/images/I/618qCW+LKsL.jpg) ![Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) - Image 3](https://m.media-amazon.com/images/I/61Z+fOi6RAL.jpg) ![Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) - Image 4](https://m.media-amazon.com/images/I/81FPbl3ALBL.jpg) ![Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) - Image 5](https://m.media-amazon.com/images/I/81p603-keJL.jpg) ## Available Options This product comes in different **Size** options. ## Frequently Bought Together - Quality Park #9 Security Envelopes, Double Window, Tamper Evident, Self Seal, Invoices/QuickBooks Statements, 3-7/8" x 8-7/8", 24 lb White, 500/Box (QUA67529) - Amazon Basics Multipurpose Copy Printer Paper, 8.5" x 11", 20 lb, 8 Reams, 4000 Sheets, 92 Bright, White - Quality Park #8 5/8 Double-Window Security Envelopes, Self-Sealing, Tamper Evident, For Checks, Payroll, 24 lb White Wove, 3-5/8 x 8-5/8 Inches, 500/Box (QUA67539) --- ## 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.co.uk/products/1894281-quality-park-9-security-envelopes-double-window-tamper-evident-self](https://www.desertcart.co.uk/products/1894281-quality-park-9-security-envelopes-double-window-tamper-evident-self) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-09-06*