---
product_id: 61650814
title: "A3 C3 Board Back Envelopes"
brand: "triplast"
price: "€ 230.53"
currency: EUR
in_stock: null
reviews_count: 8
url: https://www.desertcart.fi/products/61650814-a3-c3-board-back-envelopes
store_origin: FI
region: Finland
---

# 457x324mm perfect A3 fit Peel & seal strip for secure closure 1000 micron rigid board back A3 C3 Board Back Envelopes

**Brand:** triplast
**Price:** € 230.53
**Availability:** ❌ Out of Stock

## Summary

> 📬 Mail like a pro—secure, sleek, and sustainable!

## Quick Answers

- **What is this?** A3 C3 Board Back Envelopes by triplast
- **How much does it cost?** € 230.53 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.fi](https://www.desertcart.fi/products/61650814-a3-c3-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

- • **Speedy Seal, Zero Fuss:** Built-in peel & seal strip slashes packing time with a strong, hassle-free closure
- • **Cost-Savvy & Lightweight:** Sturdy yet light design reduces postage costs without compromising protection
- • **Flat & Flawless Delivery:** Rigid 120gsm kraft front + 1000 micron board back keeps documents crease-free and pristine
- • **Clear 'Do Not Bend' Warning:** Bold red print deters mishandling, ensuring your important documents arrive intact
- • **Eco-Friendly Packaging Power:** 100% recycled, biodegradable, and kerbside recyclable for guilt-free mailing

## Overview

Triplast’s pack of 50 A3 C3 manilla hard board 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 mailers are made from 100% recycled materials and are fully recyclable, offering a cost-effective, sustainable solution for professional mailing and storage needs.

## Description

Full description not available

## 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 |
|---------------|-------|
| Manufacturer | Triplast |
| Brand | Triplast |
| Model Number | A3 C3 |
| Product Dimensions | 32.4 x 45.7 x 0.2 cm; 113.85 g |
| Colour | Brown |
| Closure | Self-Seal |
| Shape | Rectangular |
| Material Type | Paper |
| Number of Items | 50 |
| Size | A3 C3 (457 x 324mm) |
| Sheet Size | A3 |
| Paper Finish | Uncoated |
| Manufacturer Part Number | A3 C3 |
| Item Weight | 114 g |

## Product Details

- **Brand:** Triplast
- **Colour:** Brown
- **Closure type:** Self-Seal
- **Occasion:** Graduation
- **Material:** Paper

## Images

![A3 C3 Board Back Envelopes - Image 1](https://m.media-amazon.com/images/I/71EPCxBtg0L.jpg)
![A3 C3 Board Back Envelopes - Image 2](https://m.media-amazon.com/images/I/71NaFQ8VaqL.jpg)
![A3 C3 Board Back Envelopes - Image 3](https://m.media-amazon.com/images/I/71XQNFaZ38L.jpg)
![A3 C3 Board Back Envelopes - Image 4](https://m.media-amazon.com/images/I/81dlZ5mE+tL.jpg)
![A3 C3 Board Back Envelopes - Image 5](https://m.media-amazon.com/images/I/61KEjAvFn0L.jpg)

## Available Options

This product comes in different **Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 







  
  
    Good
  

*by N***Y on Reviewed in the United Kingdom on 10 May 2023*

These envelopes are 1ft x 1½ft , you'd need carrier handle

### ⭐⭐⭐⭐ 







  
  
    Great envelopes, poorly packaged for delivery
  

*by C***M on Reviewed in the United Kingdom on 24 November 2020*

Decent envelopes for sending out artwork but pity they’re dispatched just wrapped in thin plastic as they arrived with a lot of the corners already dented and scuffed.

### ⭐⭐⭐⭐⭐ 







  
  
    Excellent lge sq calendar envelope.
  

*by S***N on Reviewed in the United Kingdom on 21 December 2019*

I was at a loss with no envelope to send my caledars by post.  At Triplast I found all sizes but most especially I foundexactly the right size to fit large square 32cm caledar.  Its not quite sqare but that works out fine as some of the calendars are not quite square!!!  Very good price too, pack of 10 for £7.45.

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**Shop now:** [https://www.desertcart.fi/products/61650814-a3-c3-board-back-envelopes](https://www.desertcart.fi/products/61650814-a3-c3-board-back-envelopes)

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*Product available on Desertcart Finland*
*Store origin: FI*
*Last updated: 2026-03-03*