---
product_id: 143520075
title: "UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing"
brand: "ucgou"
price: "$U2494"
currency: UYU
in_stock: true
reviews_count: 13
category: "Ucgou"
url: https://www.desertcart.uy/products/143520075-ucgou-poly-mailers-12x15-5-inch-black-100-pack-medium
store_origin: UY
region: Uruguay
---

# 12x15.5 inch perfect medium size Strong year-round self-sealing adhesive Waterproof & tear-proof durability UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing

**Brand:** ucgou
**Price:** $U2494
**Availability:** ✅ In Stock

## Summary

> 📦 Seal the deal with style and strength!

## Quick Answers

- **What is this?** UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing by ucgou
- **How much does it cost?** $U2494 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.uy](https://www.desertcart.uy/products/143520075-ucgou-poly-mailers-12x15-5-inch-black-100-pack-medium)

## Best For

- ucgou enthusiasts

## Why This Product

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

## Key Features

- • **Unbreakable Seal:** Four-season adhesive ensures your packages stay securely closed, no matter the weather or handling.
- • **Stand Out in Style:** Sleek black poly mailers with opaque gray lining keep your brand bold and your shipments private.
- • **Streamline Your Shipping:** No extra packaging needed—save time and boost productivity with easy peel-and-seal convenience.
- • **Built to Brave the Elements:** Thick polyethylene construction resists punctures, tears, and water for worry-free delivery.
- • **Elevate Your Brand Presence:** Eye-catching black mailers create a premium unboxing experience that customers will remember.

## Overview

UCGOU Poly Mailers are 12x15.5 inch black, medium-sized shipping bags designed for professional sellers. Featuring thick, tear-proof polyethylene with waterproof reinforcement and a strong self-sealing adhesive that works in all seasons, these 100-pack mailers protect your products and privacy while enhancing brand visibility with their sleek, opaque design.

## Description

desertcart.com : UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing : Office Products

Review: Poly mailers - These are the best poly mailers to use very strong I have all the sizes in black they are worth the purchase. I definitely recommend this product to every seller give them a try you won’t regret it 100% worth it
Review: Good product - Good product, especially if you’re a seller on any platform. Good size.

## Features

- Eye Catching Poly Mailers: The size of the bags is 12x15.5 inches. The black is an attractive color that makes your products stand out of standard white poly mailers. With gray inner lining, these poly mailers are opaque. Used tear resistant material, UCGOU poly mailers can not only protect your privacy well during transportation, but also keep your goods arriving safely
- Strong Self Sealing Adhesive: Our mailing envelopes is using four season adhesive, which can maintain strong stickiness throughout the year, even if the weather is very hot or cold. The strong stickiness prevents your items from being secretly replaced during transportation. The adhesive is covered with silver strip, which are easily peel off the strip and seal the bag
- Sturdy and Durable Construction: The thicken shipping bags covers with polyethylene material, making them not easily punctured and damaged. Beside, the shipping bags features with excellent waterproof and tearing proof effects because of the reinforce sealing on the edge. They can keep your value stuff safely to destination even though using on foggy or rainy days
- Convenient and Easy to Use: These poly shipping bags are the perfect choice for small and middle business for easily using with not require extra packaging material, which can improve your company productivity at work, save much time. It is very suitable to transport for makeup supplies, photos, magazine, books, hoodies, shoes, clothes and more
- Enhance Brand Influence: Bright colors bring a lively atmosphere, which makes the items you transport more conspicuous and will not be easily lost. Beautiful colors can also make your customers happy and enhance your brand influence. We have been committed to making better products to serve our customers, so that their business can get better and better

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07QW44JCV |
| Best Sellers Rank | #5,531 in Office Products ( See Top 100 in Office Products ) #84 in Envelope Mailers |
| Brand | UCGOU |
| Closure | Self-Seal |
| Color | Black |
| Customer Reviews | 4.8 4.8 out of 5 stars (7,206) |
| Date First Available | June 8, 2019 |
| Item Weight | 2.97 pounds |
| Manufacturer | UCGOU |
| Manufacturer Part Number | AZ131 |
| Material Type | Plastic |
| Number of Items | 100 |
| Product Dimensions | 15.5 x 12 x 0.5 inches |
| Shape | Rectangular |
| Size | 12x15.5 |

## Product Details

- **Brand:** UCGOU
- **Closure Type:** Self-Seal
- **Color:** Black
- **Material:** Plastic
- **Occasion:** Everyday Mailing

## Images

![UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing - Image 1](https://m.media-amazon.com/images/I/61x45ohVtdL.jpg)
![UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing - Image 2](https://m.media-amazon.com/images/I/61hRAMDXdEL.jpg)
![UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing - Image 3](https://m.media-amazon.com/images/I/71zLK1bz8vL.jpg)
![UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing - Image 4](https://m.media-amazon.com/images/I/61XbP6skZEL.jpg)
![UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing - Image 5](https://m.media-amazon.com/images/I/61zo4QxCy0L.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Poly mailers
*by P***E on October 31, 2025*

These are the best poly mailers to use very strong I have all the sizes in black they are worth the purchase. I definitely recommend this product to every seller give them a try you won’t regret it 100% worth it

### ⭐⭐⭐⭐⭐ Good product
*by P***T on February 4, 2026*

Good product, especially if you’re a seller on any platform. Good size.

### ⭐⭐⭐⭐⭐ Excellent Poly Mailers
*by O***Z on January 6, 2026*

One of the best Poly Mailers I’ve purchased. Great quality, bag size fits a good amount of products, and overall worth it for the price.

## Frequently Bought Together

- UCGOU Poly Mailers 12x15.5 Inch Black 100 Pack Medium Shipping Bags #5 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing
- UCGOU Poly Mailers 14.5x19 Inch Black 100 Pack Large Shipping Bags #7 Strong Thick Mailing Envelopes Self Sealing Adhesive Waterproof and Tear Proof Boutique Packaging Postal for Clothing
- UCGOU Poly Mailers 10x13 Inch Black 200 Pack Shipping Bags #4 Strong Mailing Envelopes Boutique Packaging Postal Self Seal Adhesive Waterproof and Tear Proof Small Business for Clothes Books

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**Shop now:** [https://www.desertcart.uy/products/143520075-ucgou-poly-mailers-12x15-5-inch-black-100-pack-medium](https://www.desertcart.uy/products/143520075-ucgou-poly-mailers-12x15-5-inch-black-100-pack-medium)

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*Product available on Desertcart Uruguay*
*Store origin: UY*
*Last updated: 2026-02-26*