---
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: "Bs.1607"
currency: BOB
in_stock: true
reviews_count: 13
category: "Blake"
url: https://www.desertcart.bo/products/60377604-blake-purely-packaging-c3-a3-450-x-324-mm-board
store_origin: BO
region: Bolivia
---

# C3 size 450x324 mm 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:** Bs.1607
**Availability:** ✅ In Stock

## Summary

> 📬 Send with confidence, arrive with impact!

## 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?** Bs.1607 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.bo](https://www.desertcart.bo/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

- • **Eco-Conscious Choice:** Made from 100% recycled materials—protect your mail and the planet simultaneously.
- • **Effortless Security Seal:** Peel & seal closure ensures quick, tamper-evident mailing with lasting freshness.
- • **Trusted by Professionals:** Top-rated with 4.4 stars and a loyal following among office managers and creatives alike.
- • **Clear 'Do Not Bend' Warning:** Printed front message adds an extra layer of care from postal handlers.
- • **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 (Pack of 50) combine robust 450 x 324 mm manilla board backing with a secure peel & seal closure, designed to protect valuable flat items like certificates and photographs. Featuring a clear 'Please do not bend' print, these envelopes offer professional-grade durability and eco-friendly 100% recycled content, making them a top choice for office and creative professionals seeking reliable, stylish mailing solutions.

## 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: Good quality envelopes - Nice product perfect for my needs

## 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 | 6,697 in Stationery & Office Supplies ( See Top 100 in Stationery & Office Supplies ) 98 in Envelopes |
| Brand | Blake |
| Closure | Self-Seal |
| Colour | Manilla |
| Customer Reviews | 4.4 4.4 out of 5 stars (2,571) |
| Date First Available | 23 Sept. 2014 |
| Item Weight | 2.49 kg |
| Manufacturer | Blake Envelopes |
| Manufacturer Part Number | 4200/50 |
| Material Type | Cardboard, Cardstock, Paper |
| Model Number | 4200/50 |
| Number of Items | 50 |
| Paper Finish | Uncoated |
| Product Dimensions | 46 x 33.5 x 10.5 cm; 2.49 kg |
| Shape | Rectangular |
| Sheet Size | C3 |
| Size | C3 450 x 324 mm |
| Total Recycled Content | 100 |

## 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)

## 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.

### ⭐⭐⭐⭐⭐ Good quality envelopes
*by A***R on 9 September 2025*

Nice product perfect for my needs

### ⭐⭐⭐⭐⭐ 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

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**Shop now:** [https://www.desertcart.bo/products/60377604-blake-purely-packaging-c3-a3-450-x-324-mm-board](https://www.desertcart.bo/products/60377604-blake-purely-packaging-c3-a3-450-x-324-mm-board)

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*Product available on Desertcart Bolivia*
*Store origin: BO*
*Last updated: 2026-01-23*