---
product_id: 534148909
title: "Triplast 457 x 324 mm A3 C3 Manilla Hard Board Backed Envelopes (Pack of 20), Brown"
brand: "triplast"
price: "$84.32"
currency: USD
in_stock: true
reviews_count: 5
category: "Triplast"
url: https://www.desertcart.ec/products/534148909-triplast-457-x-324-mm-a3-c3-manilla-hard-board
store_origin: EC
region: Ecuador
---

# 457 x 324 mm A3/C3 size Self-sealing peel & seal strip 115 micron rigid board backing Triplast 457 x 324 mm A3 C3 Manilla Hard Board Backed Envelopes (Pack of 20), Brown

**Brand:** triplast
**Price:** $84.32
**Availability:** ✅ In Stock

## Summary

> 📦 Seal your success with style and sturdiness!

## Quick Answers

- **What is this?** Triplast 457 x 324 mm A3 C3 Manilla Hard Board Backed Envelopes (Pack of 20), Brown by triplast
- **How much does it cost?** $84.32 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/534148909-triplast-457-x-324-mm-a3-c3-manilla-hard-board)

## 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

- • **Bulk Value Pack:** Set of 20 envelopes designed for consistent, reliable mailing needs
- • **Effortless Security:** Peel & seal strip ensures quick, tamper-proof closure every time
- • **Generous A3/C3 Dimensions:** Spacious 457 x 324 mm size fits large documents and photos with ease
- • **Professional Presentation:** Classic manilla brown with 'Please Do Not Bend' print signals care and importance
- • **Ultimate Document Protection:** Rigid 115 micron board backing prevents bending and creasing during transit

## Overview

Triplast A3 C3 Manilla Hard Board Backed Envelopes (Pack of 20) combine robust 115 micron rigid backing with a self-sealing peel strip, offering professional-grade protection for large documents. Sized at 457 x 324 mm, these brown envelopes prevent bending and creasing, making them ideal for important mailings and presentations.

## Description

These board back envelopes are ideal for sending documents in the post or via courier, and ensure they do not bend or get creased during transit. Items placed inside the envelopes are not visible through the material. All our board back envelopes have easy to peel & seal flaps and are printed with 'Please Do Not Bend' on them.

Review: Están muy bien para entrega de fotogorafías ya que la base de cartón no permite que se doblen los documentos
Review: Good quality & value. Adhesive sticks well. Board is sufficiently rigid to offer protection to items.

## Features

- A3 / C3 Size 457 x 324 mm + Lip to seal
- Manilla brown colour, solid back 115 microns thick
- Triplast branded, self sealing peel and seal strip
- Number of items: 20.0

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B01H01UHS6 |
| Best Sellers Rank | #1,172,944 in Office Products ( See Top 100 in Office Products ) #2,995 in Business Mailing Envelopes |
| Brand | Triplast |
| Closure | Self-Seal |
| Color | Brown |
| Customer Reviews | 4.6 4.6 out of 5 stars (924) |
| Date First Available | August 4, 2016 |
| Item Weight | 4 ounces |
| Item model number | A3 C3 |
| Manufacturer | Triplast |
| Manufacturer Part Number | A3 C3 |
| Material Type | Cardboard |
| Number of Items | 20 |
| Paper Finish | Uncoated |
| Product Dimensions | 12.76 x 17.99 x 0.08 inches |
| Shape | Rectangular |
| Size | pack of 20 |

## Product Details

- **Brand:** Triplast
- **Closure Type:** Self-Seal
- **Color:** Brown
- **Material:** Cardboard
- **Occasion:** [Anytime]

## Images

![Triplast 457 x 324 mm A3 C3 Manilla Hard Board Backed Envelopes (Pack of 20), Brown - Image 1](https://m.media-amazon.com/images/I/71EPCxBtg0L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by I***A on March 27, 2018*

Están muy bien para entrega de fotogorafías ya que la base de cartón no permite que se doblen los documentos

### ⭐⭐⭐⭐⭐ Review
*by L***N on April 18, 2025*

Good quality & value. Adhesive sticks well. Board is sufficiently rigid to offer protection to items.

### ⭐⭐⭐⭐⭐ Review
*by P***E on April 28, 2019*

Excellent pour la protection et la remises de photos, sous passe-partout de 30 x 40 cm

## Frequently Bought Together

- Triplast 20 x A3 C3 Manilla Hard Board Back Envelopes (457x324mm) - Cardboard Backed Envelopes with Peel & Seal Strip - Rigid Do Not Bend Envelopes for Mailing Posting Shipping & Storing Documents
- 20Pcs A4 Envelopes Self-Seal iSOUL 324mm x 229mm A4 C4 Manilla Hard Board Backed Envelopes Do Not Bend Envelope

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**Shop now:** [https://www.desertcart.ec/products/534148909-triplast-457-x-324-mm-a3-c3-manilla-hard-board](https://www.desertcart.ec/products/534148909-triplast-457-x-324-mm-a3-c3-manilla-hard-board)

---

*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-01-23*