---
product_id: 340671058
title: "Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930)"
brand: "columbian"
price: "A$123"
currency: AUD
in_stock: true
reviews_count: 5
category: "Columbian"
url: https://www.desertcart.com.au/products/340671058-columbian-9-x-12-security-envelopes-100-box-9-x
store_origin: AU
region: Australia
---

# Oversized 9 x 12 inch dimensions Tamper-evident SimplySafe seal Security tinted interior blocks view Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930)

**Brand:** columbian
**Price:** A$123
**Availability:** ✅ In Stock

## Summary

> 🔐 Seal it. Secure it. Send it with confidence.

## Quick Answers

- **What is this?** Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) by columbian
- **How much does it cost?** A$123 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/340671058-columbian-9-x-12-security-envelopes-100-box-9-x)

## Best For

- columbian enthusiasts

## Why This Product

- Trusted columbian brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Unmatched Security:** Patented SimplySafe seal reveals any tampering instantly, keeping your sensitive documents safe and sound.
- • **Oversized & Versatile:** Generous 9 x 12 inch size fits large documents, perfect for contracts, tax forms, and confidential reports.
- • **Privacy You Can Trust:** Blue scrambled security tint obscures contents, protecting your information from prying eyes.
- • **Effortless Seal & Open:** Release & Seal peel strip ensures a clean, moisture-free closure, while the tamper-evident pull strip guarantees easy, damage-free access.
- • **Bulk Value for Professionals:** Box of 100 heavyweight 28 lb white wove paper envelopes—stock up and stay prepared for all your mailing needs.

## Overview

Columbian 9 x 12 Security Envelopes come in a box of 100, featuring patented SimplySafe tamper-evident seals and a security tinted interior to protect sensitive documents. The self-seal Release & Seal strip offers a clean, moisture-free closure, while the pull strip allows easy, damage-free opening. Made from durable 28 lb white wove paper, these envelopes are ideal for mailing oversized confidential paperwork securely and professionally.

## Description

Columbian 9 x 12 SimplySafe Security Envelopes are ideal for mailing important documents or sending sensitive client information. Each security tinted envelope has a scrambled blue pattern printed on the interior that conceals the contents. The patented SimplySafe seal is constructed to show any signs of tampering. These mailing envelopes are still easy for the sender to close and the intended recipient to open. The Release & Seal strip peels right off so you can press to seal without any moisture. A pull strip makes opening the envelope straightforward and prevents you from tearing the documents inside. These self seal envelopes are inkjet printer compatible, though not recommended for a laser printer (use address labels instead). Stock up on 9" x 12" security envelopes for billing paperwork, tax documents, accounting records and more. Made from durable 28 lb paper. Overall envelope dimensions are 9 x 12 inches. White. Box of 100.

Review: Super surprised at the quality of this envelope. Very secure and thick. Even my boss remarked on it! Great value!
Review: No complaints. I have a mail order company so I go through a lot of envelopes. Tried these out and they're pretty much what I expected -standard envelope quality that's no better or worse than any other. The self seal sticks well. Thought they were priced well and have no complaints.

## Features

- Get a box of 100 Columbian 9 x 12 envelopes with SimplySafe tamper-evident pull strips and security tinted interiors for mailing sensitive oversized documents; easy peel off Release & Seal closure
- Columbian 9 x 12 envelopes have a patented SimplySafe seal that will show signs of tampering, safeguarding against unauthorized opening
- Security envelopes have a strong security tint pattern so you can't see what's inside; ideal for obscuring more sensitive information and protecting critical documents
- These self seal envelopes have a Release & Seal peel strip; peel off the paper strip and press down for a permanent seal; it's simple, clean, and sanitary with no moisture required
- Stock up on these catalog envelope 100 packs made from heavyweight 28 lb white wove paper

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08TRNHQWP |
| Brand | Columbian |
| Closure | Self-Seal |
| Colour | White |
| Customer Reviews | 4.7 4.7 out of 5 stars (953) |
| Date First Available | 23 Jan. 2021 |
| Item Weight | 1.84 kg |
| Manufacturer | TOPS Products |
| Manufacturer Part Number | COLO930 |
| Material Type | Paper |
| Model Number | COLO930 |
| Number of Items | 100 |
| Product Dimensions | 30.96 x 24.77 x 7.62 cm; 1.84 kg |
| Shape | Rectangular |
| Size | 9 x 12 |

## Product Details

- **Brand:** Columbian
- **Closure type:** Self-Seal
- **Colour:** White
- **Material:** Paper
- **Occasion:** Business/Professional

## Images

![Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) - Image 1](https://m.media-amazon.com/images/I/61oXjE7xZKL.jpg)
![Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) - Image 2](https://m.media-amazon.com/images/I/71UU+4P7vNL.jpg)
![Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) - Image 3](https://m.media-amazon.com/images/I/71bFOOg1YNL.jpg)
![Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) - Image 4](https://m.media-amazon.com/images/I/71m6VtxX+1L.jpg)
![Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930) - Image 5](https://m.media-amazon.com/images/I/71mUJEBH3rL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by N***Y on 23 December 2025*

Super surprised at the quality of this envelope. Very secure and thick. Even my boss remarked on it! Great value!

### ⭐⭐⭐⭐⭐ Review
*by K***D on 20 November 2025*

No complaints. I have a mail order company so I go through a lot of envelopes. Tried these out and they're pretty much what I expected -standard envelope quality that's no better or worse than any other. The self seal sticks well. Thought they were priced well and have no complaints.

### ⭐⭐⭐⭐⭐ Review
*by V***N on 21 December 2025*

It is good product. thanks

## Frequently Bought Together

- Columbian 9 x 12 Security Envelopes, 100/Box, 9 x 12 Inches, Release & Seal Self Seal, SimplySafe Tamper Evident Pull Strip, White (COLO930)
- 40#10 Security Tinted Self-Seal Envelopes - No Window, EnveGuard, Size 4-1/8 X 9-1/2 Inches - White - 24 LB - 40 Count (34140)
- Amazon Basics 1/3-Cut Tab, Assorted Positions File Folders, Letter Size, Manila - Pack of 100

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-28*