--- 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: "£24.41" currency: GBP in_stock: true reviews_count: 13 category: "Ucgou" url: https://www.desertcart.co.uk/products/143520075-ucgou-poly-mailers-12x15-5-inch-black-100-pack-medium store_origin: GB region: United Kingdom --- # 12x15.5 inch perfect medium size Strong 4-season self-sealing adhesive Opaque black with gray inner lining 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:** £24.41 **Availability:** ✅ In Stock ## Summary > 🖤 Seal it. Ship it. Stand out. ## 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?** £24.41 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/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 - • **Boost Brand Visibility:** Vibrant black mailers create a memorable unboxing experience that keeps customers coming back. - • **Streamline Your Shipping:** No extra packaging needed—lightweight, easy-to-use mailers boost your productivity and cut prep time. - • **All-Weather Seal Security:** Four-season adhesive ensures your packages stay sealed tight rain or shine—no tampering, no worries. - • **Stand Out with Sleek Black:** Elevate your brand with eye-catching opaque black mailers that scream premium and privacy. - • **Durability That Defies Damage:** Thick polyethylene construction resists tears, punctures, and water, protecting your goods in transit. ## Overview UCGOU 12x15.5 inch black poly mailers (100 pack) combine durable, tear-resistant polyethylene with a strong, weatherproof self-sealing adhesive. Their opaque black design with gray lining protects privacy while enhancing brand presence. Ideal for small to medium businesses, these waterproof mailers simplify shipping for clothing, books, and more, ensuring your products arrive safe and stylish. ## 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: Great size and quality! - Great size and quality! Review: Durable and lightweight! Great for shipping! - These have been working perfectly for shipping my sold thrift items to my website customers. I purchased the smaller size first and once I saw how well they worked, got the larger size. They Can old quite a bit and don't add the shipping weight that boxes can. Big fan! ## 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 | | Additional Features | Waterproof | | Best Sellers Rank | #5,914 in Office Products ( See Top 100 in Office Products ) #82 in Envelope Mailers | | Brand Name | UCGOU | | Closure Type | Self-Seal | | Color | Black | | Customer Reviews | 4.8 4.8 out of 5 stars (7,228) | | Item Dimensions L x W | 15.5"L x 12"W | | Item Shape | Rectangular | | Manufacturer | UCGOU | | Material Type | Plastic | | Number of Items | 100 | | Occasion | Everyday Mailing | | Size | 12x15.5 | | Style | Poly | | UPC | 602447068164 | | Unit Count | 100 Count | ## 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) ## Available Options This product comes in different **Color, Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great size and quality! *by G***C on April 21, 2026* Great size and quality! ### ⭐⭐⭐⭐⭐ Durable and lightweight! Great for shipping! *by S***S on March 23, 2026* These have been working perfectly for shipping my sold thrift items to my website customers. I purchased the smaller size first and once I saw how well they worked, got the larger size. They Can old quite a bit and don't add the shipping weight that boxes can. Big fan! ### ⭐⭐⭐⭐⭐ 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 ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/143520075-ucgou-poly-mailers-12x15-5-inch-black-100-pack-medium](https://www.desertcart.co.uk/products/143520075-ucgou-poly-mailers-12x15-5-inch-black-100-pack-medium) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-19*