--- product_id: 47277918 title: "500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16\" x 8-3/4\" (NOT FOR INVOICES)" brand: "sigma source" price: "€ 69.48" currency: EUR in_stock: false reviews_count: 8 category: "Office Products" url: https://www.desertcart.pt/products/47277918-500-8-self-seal-double-window-check-envelopes-security-tinted store_origin: PT region: Portugal --- # 500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16" x 8-3/4" (NOT FOR INVOICES) **Brand:** sigma source **Price:** € 69.48 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** 500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16" x 8-3/4" (NOT FOR INVOICES) by sigma source - **How much does it cost?** € 69.48 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/47277918-500-8-self-seal-double-window-check-envelopes-security-tinted) ## Best For - sigma source enthusiasts ## Why This Product - Trusted sigma source brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Size: 500Sigma Source Double Window Check Envelopes (3 9/16 x 8 3/4):Envelopes are designed for payroll checks, quickbooks checks and Laser checks.Our business check envelopes are compatible with standard 3 1/2" x 8 1/2" online printable checks that allow addresses on check to show through windows Our #8 Envelopes are designed for check envelopes - NOT for invoices or billing statements. (If you're sending invoices or billing statements use #9 Envelope instead - see ASIN# B07452HFQB)Key Features and Characteristics:#8 Envelope size is 3-9/16" x 8-3/4" – is just the right size for Quickbooks checks and other business Computer Checks.Adhesive is easy peel and self-sealing - Glue is prime quality and it easily shows if envelope seal is tampered.Self-seal business envelopes is designed to hide sensitive information Envelope is security tinted with blue checkered design - for confidentiality, preventing check content from showing or someone peeking!Color is White and is made with 24 LB Premium Smooth/Woven paper - envelope is strong (not flimsy or cheap)Primary Usage and Key Benefits: For mailing payroll checks or business checks to employees or to professional clients Hand-over Employees their paychecks enclosed in check envelopes is professional and dignifying - they feel respected and trusted. No need to print recipient or sender address on envelopes - simply print your quickbook check then slip it inside the check envelope. Saves time and expenses of separately addressing envelopes - simply position the addresses to show through the windows ## Features - Designed for Quickbooks checks, Laser checks and it is compatible with other online printable checks (DOES NOT FIT INVOICES) - Envelope is Double Window and Security Tinted for added privacy to protect check content and confidentiality - Envelope has easy peel and self-seal features - saves time and cost - Adhesive is strong and stays glued during transport - no water or Licking Required! Just peel, press and you're done! - Color: White, Texture: Smooth/Woven; Quantity: 500/box, Dimension: 3-9/16" x 8-3/4" (Checks Will Not Move) ## Images ![500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16" x 8-3/4" (NOT FOR INVOICES) - Image 1](https://images-na.ssl-images-amazon.com/images/I/41gqoRqyUFL.jpg) ![500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16" x 8-3/4" (NOT FOR INVOICES) - Image 2](https://images-na.ssl-images-amazon.com/images/I/51M6S%2BPblML.jpg) ![500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16" x 8-3/4" (NOT FOR INVOICES) - Image 3](https://images-na.ssl-images-amazon.com/images/I/51YZFLMOTiL.jpg) ![500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16" x 8-3/4" (NOT FOR INVOICES) - Image 4](https://images-na.ssl-images-amazon.com/images/I/517NNOAFQCL.jpg) ![500 #8 SELF SEAL Double Window CHECK Envelopes, Security Tinted, Premium Peel and Seal Adhesive, Designed for QuickBooks Checks, Business Checks, Laser Checks Size 3-9/16" x 8-3/4" (NOT FOR INVOICES) - Image 5](https://images-na.ssl-images-amazon.com/images/I/51Bd8KwMT7L.jpg) ## Customer Reviews ### ⭐⭐⭐ User Friendliness Slipped a Little *by T***T on December 14, 2017* The previous batch I received were Great. The seal protector had a corner protruding from the flap so it was easy to grab. These fit snugger, and the seal cover (for lack of the technical term) is below the edge of the flap, making it tougher to grab. They also curl up and flop all over the place, making clean up take longer. The batch before were thicker and fell into a neat pile. They still work fine, and the windows fit QuickBooks checks, but my envelope stuffing is taking a little longer. ### ⭐⭐⭐⭐⭐ Works perfectly with Quickbook checks. *by D***H on January 10, 2018* Works perfectly with Quickbooks checks. Windows are perfectly aligned and shows just what you want. I have found that with some other envelopes the windows are too large and show the memo line. That is not the case with these envelopes. The envelope paper is the perfect thickness that makes it easier to insert the checks. The self seal strip is easy to remove. I would never want to go back to using regular gummed envelopes. ### ⭐ The self-sealing doesn't actually seal. *by B***R on October 25, 2017* Don't purchase this product as the self-sealing doesn't actually work. Although it appears that the envelope seals, within minutes the stickiness disappears and the envelope is able to reopen. I highly recommend looking elsewhere. --- ## 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.pt/products/47277918-500-8-self-seal-double-window-check-envelopes-security-tinted](https://www.desertcart.pt/products/47277918-500-8-self-seal-double-window-check-envelopes-security-tinted) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-06-20*