--- product_id: 1894281 title: "#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: "1141 kr" currency: DKK in_stock: true url: https://www.desertcart.dk/products/1894281-9-security-envelopes-double-window-tamper-evident-self-seal-invoices store_origin: DK region: Denmark --- # Precise double window sizing Bulk 500-envelope supply Tamper-evident security seal #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:** 1141 kr **Availability:** ✅ In Stock ## Summary > 🔐 Secure your mail, impress your clients—privacy meets professionalism! ## Quick Answers - **What is this?** #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?** 1141 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.dk](https://www.desertcart.dk/products/1894281-9-security-envelopes-double-window-tamper-evident-self-seal-invoices) ## 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 - • **Mess-Free Self Seal:** No peel strips or sticky residue—seal fast and clean every time. - • **Advanced Privacy Shield:** Reflex blue security tint blocks prying eyes, even under light. - • **Bulk Ready for Business:** 500 envelopes per box to keep your office running without pause. - • **Reveal-N-Seal Tamper Alert:** Patented self-seal flap reveals any unauthorized access instantly. - • **Streamlined Double Window Design:** Showcases sender & receiver info perfectly—no extra handling needed. ## Overview Quality Park #9 Security Envelopes combine precision double windows with a reflex blue security tint to protect sensitive information. Featuring a patented Reveal-N-Seal self-seal closure that shows tampering, these 24 lb white envelopes come in bulk boxes of 500, designed for seamless use with invoices and statements sized 3-7/8" x 8-7/8". Ideal for finance and accounting professionals who demand efficiency and confidentiality. ## Description Quality Park #9 Double Window Envelopes have layered privacy features to keep checks secure. Reveal-N-Seal self seal envelope flaps are perforated to show evidence of tampering. Opaque envelope sides have a complex security pattern inside that obscures letters and numbers, even when held to light. Careful window placement shows only the sender and receiver addresses while check amounts and other data remain private and protected. Built for Finance & Accounting: These double window envelopes are compatible with most 3-7/8" x 8-7/8" invoices and statements. Made with modern side-seam construction in crisp, bright white 24 lb white wove paper. Our patented seal prevents waste two ways. The fold-in-place lower flap on these safety envelopes can't stick prematurely, so there are no wasted envelopes in your box — just lift the bottom flap when you're ready and press to seal. Plus, the fold-in-place envelope flap means there's no peel-away strip mess to clean up later. The innovative design also preserves the adhesive and lengthens shelf life until use. 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 | |---------------|-------| | Manufacturer | TOPS Products | | Brand | Quality Park | | Item Weight | 0.16 ounces | | Product Dimensions | 13.78 x 9.25 x 3.86 inches | | Item model number | QUA67529 | | Is Discontinued By Manufacturer | No | | Color | White | | Closure | Self-Seal | | Shape | L Shaped | | Material Type | Paper | | Number of Items | 1 | | Size | 3-7/8 x 8-7/9 | | Sheet Size | 3-7/8 x 8-7/8 | | Paper Weight | 24 | | Ink Color | White | | Manufacturer Part Number | QUA67529 | ## Product Details - **Brand:** Quality Park - **Color:** White - **Closure Type:** Self-Seal - **Occasion:** Business/Professional - **Material:** Paper ## Images ![#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) ## 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? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.dk/products/1894281-9-security-envelopes-double-window-tamper-evident-self-seal-invoices](https://www.desertcart.dk/products/1894281-9-security-envelopes-double-window-tamper-evident-self-seal-invoices) --- *Product available on Desertcart Denmark* *Store origin: DK* *Last updated: 2026-06-02*