---
product_id: 317332442
title: "Columbian #8 5/8 Security Envelopes, 500/Box, Double Window, 3-5/8\" x 8-5/8\", Release & Seal Self Seal, SimplySafe Tamper Evident, White (COLO156)"
brand: "columbian envelopes"
price: "20.63 OMR"
currency: OMR
in_stock: true
url: https://www.desertcart.com.om/products/317332442-columbian-8-5-8-security-envelopes-500-box-double-window
store_origin: OM
region: Oman
---

# 500 count Tamper-evident Double window Columbian #8 5/8 Security Envelopes, 500/Box, Double Window, 3-5/8" x 8-5/8", Release & Seal Self Seal, SimplySafe Tamper Evident, White (COLO156)

**Brand:** columbian envelopes
**Price:** 20.63 OMR
**Availability:** ✅ In Stock

## Summary

> 📬 Seal the Deal with Confidence!

## Quick Answers

- **What is this?** Columbian #8 5/8 Security Envelopes, 500/Box, Double Window, 3-5/8" x 8-5/8", Release & Seal Self Seal, SimplySafe Tamper Evident, White (COLO156) by columbian envelopes
- **How much does it cost?** 20.63 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/317332442-columbian-8-5-8-security-envelopes-500-box-double-window)

## Best For

- columbian envelopes enthusiasts

## Why This Product

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

## Key Features

- • **Privacy First:** Security tinted interior keeps contents hidden.
- • **Bulk Convenience:** Jumbo box of 500 for all your mailing needs.
- • **Effortless Sealing:** Release & Seal peel strip for a clean close.
- • **Secure Your Secrets:** Patented SimplySafe seal shows tampering.
- • **Professional Presentation:** Double windows for clear sender & receiver display.

## Overview

The Columbian #8 5/8 Security Envelopes come in a bulk pack of 500, featuring a patented SimplySafe tamper-evident seal, security tinted interior, and a user-friendly Release & Seal closure. Designed for privacy and ease of use, these envelopes are perfect for securely mailing sensitive documents.

## Description

Columbian #8 5/8 Security Envelopes, 500/Box, Double Window, 3-5/8" x 8-5/8", Release & Seal Self Seal, SimplySafe Tamper Evident, White (COLO156)

## Features

- Get a jumbo box of 500 Columbian double window #8 5/8 envelopes (3-5/8" x 8-5/8") each with a SimplySafe tamper-evident pull strip, security tinted interior, and easy peel off Release & Seal closure
- These security envelopes have a patented SimplySafe seal that will show signs of tampering, safeguarding you against unauthorized opening
- Each white envelope is made from 24 lb white wove paper with an interior security tint pattern so you can't see what's inside; ideal for obscuring sensitive information & 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
- Double window envelopes display just the sender & receiver addresses and keep sensitive information out of view; top window: 13/16" x 3-1/2"; bottom window: 1" x 4"; envelope: 3-5/8" x 8-5/8"

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | TOPS Products |
| Brand | Columbian Envelopes |
| Item Weight | 5.3 pounds |
| Product Dimensions | 12.13 x 9.13 x 3.75 inches |
| Item model number | COLO156 |
| Color | White |
| Closure | Self-Seal |
| Shape | Rectangular |
| Material Type | Paper |
| Number of Items | 500 |
| Size | #8-5/8 |
| Sheet Size | 3-5/8 x 8-5/8 |
| Paper Finish | Wove |
| Manufacturer Part Number | COLO156 |

## Product Details

- **Brand:** Columbian Envelopes
- **Color:** White
- **Closure Type:** Self-Seal
- **Material:** Paper
- **Number of Items:** 500

## Images

![Columbian #8 5/8 Security Envelopes, 500/Box, Double Window, 3-5/8" x 8-5/8", Release & Seal Self Seal, SimplySafe Tamper Evident, White (COLO156) - Image 1](https://m.media-amazon.com/images/I/71mTHWXmbQL.jpg)

## Frequently Bought Together

- Columbian #8 5/8 Security Envelopes, 500/Box, Double Window, 3-5/8" x 8-5/8", Release & Seal Self Seal, SimplySafe Tamper Evident, White (COLO156)
- Columbian #10 Security Envelopes, 500/Box, No Window, 4-1/8 x 9-1/2 Inches, Release & Seal Self Seal, White (COLO151)
- Amazon Basics 1/3-Cut Tab, Assorted Positions File Folders, Letter Size, Manila - Pack of 100

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**Shop now:** [https://www.desertcart.com.om/products/317332442-columbian-8-5-8-security-envelopes-500-box-double-window](https://www.desertcart.com.om/products/317332442-columbian-8-5-8-security-envelopes-500-box-double-window)

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-01-28*