--- product_id: 61650814 title: "Triplast 50 x A3 C3 Manilla Hard Board Back Envelopes (457x324mm) - Cardboard Backed Mailers with Peel & Seal Strip - Rigid Do Not Bend Envelopes for Mailing Posting Shipping & Storing Documents" brand: "triplast" price: "€ 61.25" currency: EUR in_stock: true category: "Triplast" url: https://www.desertcart.be/products/61650814-triplast-50-x-a3-c3-manilla-hard-board-back-envelopes store_origin: BE region: Belgium --- # 457x324mm perfect A3 fit Peel & seal secure closure 1000 micron rigid board back Triplast 50 x A3 C3 Manilla Hard Board Back Envelopes (457x324mm) - Cardboard Backed Mailers with Peel & Seal Strip - Rigid Do Not Bend Envelopes for Mailing Posting Shipping & Storing Documents **Brand:** triplast **Price:** € 61.25 **Availability:** ✅ In Stock ## Summary > 📬 Mail like a pro—rigid, reliable, and ready to impress! ## Quick Answers - **What is this?** Triplast 50 x A3 C3 Manilla Hard Board Back Envelopes (457x324mm) - Cardboard Backed Mailers with Peel & Seal Strip - Rigid Do Not Bend Envelopes for Mailing Posting Shipping & Storing Documents by triplast - **How much does it cost?** € 61.25 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/61650814-triplast-50-x-a3-c3-manilla-hard-board-back-envelopes) ## Best For - triplast enthusiasts ## Why This Product - Trusted triplast brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Effortless Sealing:** Built-in peel & seal strip slashes packing time with a strong, tamper-proof seal every time. - • **Eco-Friendly Packaging:** Made from 100% recycled, biodegradable materials—protect your mail and the planet simultaneously. - • **Ultimate Flat Protection:** 120gsm kraft front + 1000 micron rigid back keeps your documents crease-free and pristine. - • **Clear Handling Instructions:** Bold red 'Please do not bend' print ensures your important documents get VIP treatment. - • **Cost-Effective & Lightweight:** Sturdy yet light design reduces postage costs without compromising durability. ## Overview Triplast’s 50-pack of A3 C3 manilla hard board back envelopes combines robust 1000 micron rigid backing with a 120gsm kraft front to protect flat documents from bending. Featuring a peel & seal strip for quick, secure closure, these eco-conscious envelopes are made from 100% recycled materials and are fully recyclable. Perfect for professionals mailing artwork, blueprints, or legal papers, they offer a cost-effective, lightweight, and sustainable mailing solution. ## Description Great prices on your favourite Office brands plus free delivery and returns on eligible orders. ## Features - A MAILING ESSENTIAL: Pack of 50 x C3 rigid mailers designed to contain unfolded A3 paper (or A2 paper folded in half) - perfectly sized for posting & storing flat posters, artwork, sketches, paintings, blueprints, calendars & legal documents - WILL NOT BEND: 120gsm kraft paper front & 1000 micron board back construction offers all-round protection & rigidity to keep contents flat, crease-free & safe. "Please do not bend" is printed in large red font on the front to caution all handlers. - QUICK, EASY & SECURE: Built-in peel & seal strip reduces packing time & cost by providing a strong & hassle-free seal while also offering extended shelf-life over self seal envelopes - just remove the strip & press the flap down to seal! - SAVE ON PACKAGING & POSTAGE: A more cost-effective & waste-free alternative to all board envelopes, these light yet sturdy card backed envelopes are also cheaper to post. You may write on them directly to eliminate the need for extra address labels. - AN ECO-CONSCIOUS CHOICE: Made from 100% recycled material, fully kerbside recyclable & biodegradable - these hard back envelopes are a plastic-free, sustainable & environmentally conscious packaging choice for office, school & home use. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01H01UHW2 | | Best Sellers Rank | 4,400 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 30 in Packing List Envelopes | | Brand Name | Triplast | | Closure Type | Self-Seal | | Colour | Brown | | Country Of Origin | United Kingdom | | Customer Reviews | 4.6 4.6 out of 5 stars (958) | | Global Trade Identification Number | 05056025163164 | | Item Dimensions L x W | 45.7L x 32.4W centimetres | | Item Shape | Rectangular | | Item Type Name | Board Backed Envelopes | | Item Weight | 0.25 Pounds | | Manufacturer | Triplast | | Material Type | Paper | | Model Name | Triplast Board Back Envelopes | | Number of Items | 50 | | Occasion | Graduation | | Occasion Type | Anytime | | Product Warranty | China | | Recommended Uses For Product | Cash, Disc, Invitation Card, Letter | | Size | A3 C3 (457 x 324mm) | | Special Features | Lightweight, Self-Adhesive Closure | | Style | Flat | | Unit Count | 50.0 count | ## Product Details - **Brand:** Triplast - **Closure type:** Self-Seal - **Colour:** Brown - **Material:** Paper - **Occasion:** Graduation ## Images ![Triplast 50 x A3 C3 Manilla Hard Board Back Envelopes (457x324mm) - Cardboard Backed Mailers with Peel & Seal Strip - Rigid Do Not Bend Envelopes for Mailing Posting Shipping & Storing Documents - Image 1](https://m.media-amazon.com/images/I/71EPCxBtg0L.jpg) ## Available Options This product comes in different **Number Of Items** options. --- ## 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.be/products/61650814-triplast-50-x-a3-c3-manilla-hard-board-back-envelopes](https://www.desertcart.be/products/61650814-triplast-50-x-a3-c3-manilla-hard-board-back-envelopes) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-09-15*