--- product_id: 60377604 title: "Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50" brand: "blake" price: "€ 49.61" currency: EUR in_stock: true reviews_count: 13 category: "Blake" url: https://www.desertcart.fr/products/60377604-blake-purely-packaging-c3-a3-450-x-324-mm-board store_origin: FR region: France --- # 450 x 324 mm C3 size Strong peel & seal closure Heavy-duty board back protection Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 **Brand:** blake **Price:** € 49.61 **Availability:** ✅ In Stock ## Summary > 📬 Protect your mail like a pro—because first impressions start with the envelope. ## Quick Answers - **What is this?** Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 by blake - **How much does it cost?** € 49.61 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.fr](https://www.desertcart.fr/products/60377604-blake-purely-packaging-c3-a3-450-x-324-mm-board) ## Best For - blake enthusiasts ## Why This Product - Trusted blake brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Bulk Pack Efficiency:** 50 envelopes per pack—perfect for busy professionals who demand reliability and value in every shipment. - • **Premium Manilla Finish:** Light brown, professional look that stands out in the mailroom and complements your brand’s polished image. - • **Effortless Security Seal:** Strong peel & seal closure ensures your contents stay safe and tamper-proof with zero hassle. - • **Clear 'Do Not Bend' Warning:** Printed front message adds an extra layer of care from postal handlers—because your mail deserves respect. - • **Ultimate Flat Mail Protection:** Heavy-duty board backing shields certificates, prints, and photos from bending or damage. ## Overview Blake Purely Packaging C3 Board Back Peel & Seal Envelopes (450 x 324 mm) offer premium, heavy-duty protection for important documents and prints. Featuring a durable board backing and a secure peel & seal closure, these manilla envelopes come with a clear 'Please do not bend' print to ensure careful handling. Ideal for professionals who want reliable, stylish, and efficient mailing solutions in bulk packs of 50. ## Description Great prices on your favourite Office brands plus free delivery and returns on eligible orders. Review: The only brand of board backed envelopes I will buy - Excellent board backed envelopes, with 'please do not bend' printed clearly on them. I made the mistake recently of buying a cheaper alternative and definitely regret it. (For the saving of several pounds, I am now stuck with more than 100 flimsy, bendable envelopes with an unpleasant font on the front!) Both the grey board and the brown kraft paper used are of decent thickness to protect most flat items. They are also durable and reliable. Would definitely recommend. Although, for e.g. single prints, they might still need cardboard stiffeners so bear this in mind. Review: Great product - Very durable, functions well. Seals very well. Postage is protected. Great value for money. Brought many times. Light brown colour. Can be used for cards and large letter. Lightweight ## Features - Make a difference to your mail with these Purely Packaging Board Back envelopes by Blake - Heavy Duty Board Back to protect certificates, photographs, prints and more - Strong Peel & Seal closure for ease of use, additional security and longer shelf life - Printed 'Please do not bend' on the face for extra safety - Printed Do Not Bend on the front ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B00O4X7W00 | | Best Sellers Rank | 6,803 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 89 in Envelopes | | Brand Name | Blake | | Closure Type | Self-Seal | | Colour | Manilla | | Customer Reviews | 4.6 4.6 out of 5 stars (2,287) | | Global Trade Identification Number | 05055559719472, 05055559753087 | | Item Dimensions L x W | 45L x 32.4W centimetres | | Item Shape | Rectangular | | Item Type Name | Purely Packaging C3 450x324mm Board Back Envelope Box of 50 | | Item Weight | 2.49 kg | | Manufacturer | Blake Envelopes | | Material Type | Cardboard, Cardstock, Paper | | Model Name | Everyday - Board Back Envelopes | | Number of Items | 50 | | Occasion | Envelopes | | Occasion Type | Arts and Craft, Business, Envelopes, Mailing, Office | | Recommended Uses For Product | Business, Envelopes, Invitation Card, Letter, Office | | Size | C3 450 x 324 mm | | Special Features | Board, Card, Lightweight, Premium, Self-Adhesive Closure | | Style | Pack of 50 (No Window) | | Unit Count | 50.0 Count | ## Product Details - **Brand:** Blake - **Closure type:** Self-Seal - **Colour:** Manilla - **Material:** Cardboard, Cardstock, Paper - **Occasion:** Envelopes ## Images ![Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 - Image 1](https://m.media-amazon.com/images/I/81S2chsbi1L.jpg) ![Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 - Image 2](https://m.media-amazon.com/images/I/51tbdcM9eDL.jpg) ![Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 - Image 3](https://m.media-amazon.com/images/I/91pcEkCy2CL.jpg) ![Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 - Image 4](https://m.media-amazon.com/images/I/71kt-dr7YoL.jpg) ![Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 - Image 5](https://m.media-amazon.com/images/I/61bgTwDlhuL.jpg) ## Available Options This product comes in different **Color, Size, Style** options. ## Questions & Answers **Q: which size is a4? c4?** A: The 'A' prefix is the paper size; the 'C' prefix is the envelope size. A4 paper fits unfolded inside a C4 envelope (similarly A5/C5, A6/C6, etc). **Q: What is the gsm of both the paper and the board? Want a thick board back that won’t easily bend** A: I don't know what the gsm is but I found them pretty sturdy and sent photos using them. **Q: would my card 160cm x 155cm fit in this envelope** A: Yes the envelopes are 229 x 162 so your items would fit. **Q: Will this fit a A3 print?** A: Yes. I use it to fit A3 booklets. ## Customer Reviews ### ⭐⭐⭐⭐⭐ The only brand of board backed envelopes I will buy *by T***R on 6 December 2024* Excellent board backed envelopes, with 'please do not bend' printed clearly on them. I made the mistake recently of buying a cheaper alternative and definitely regret it. (For the saving of several pounds, I am now stuck with more than 100 flimsy, bendable envelopes with an unpleasant font on the front!) Both the grey board and the brown kraft paper used are of decent thickness to protect most flat items. They are also durable and reliable. Would definitely recommend. Although, for e.g. single prints, they might still need cardboard stiffeners so bear this in mind. ### ⭐⭐⭐⭐⭐ Great product *by V***. on 30 December 2024* Very durable, functions well. Seals very well. Postage is protected. Great value for money. Brought many times. Light brown colour. Can be used for cards and large letter. Lightweight ### ⭐⭐⭐⭐⭐ Quick delivery *by P***Y on 2 December 2025* Quick delivery at a good price ## Frequently Bought Together - Blake Purely Packaging C3 (A3) 450 x 324 mm Board Back Pocket Peel & Seal Envelopes (4200/50) Manilla - Pack of 50 - A3 Cello Bags - Crystal Clear & Good Thickness - for A3 Artwork/Photos (420MM x 306MM) - Makes Your Work Feel Pricey - 30mm Seal - 40Micron - Super Strong Seams - House of Card & Paper Grey Kraft Board 1500micron 945gsm A3 Size 30 Sheets per Pack, HCP476 --- ## 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.fr/products/60377604-blake-purely-packaging-c3-a3-450-x-324-mm-board](https://www.desertcart.fr/products/60377604-blake-purely-packaging-c3-a3-450-x-324-mm-board) --- *Product available on Desertcart France* *Store origin: FR* *Last updated: 2026-04-23*