--- product_id: 88563316 title: "Stayflats Plus Mailers | Rigid Shipping Envelopes | Tamper Evident Security With Peel & Seal Pressure Sensitive Closure | Built-In Corner Protection | White | 100 Per Case | 7\" x 9\"" brand: "stayflats" price: "€ 58.66" currency: EUR in_stock: false reviews_count: 8 category: "Office Products" url: https://www.desertcart.pt/products/88563316-stayflats-plus-mailers-rigid-shipping-envelopes-tamper-evident-security-peel store_origin: PT region: Portugal --- # Stayflats Plus Mailers | Rigid Shipping Envelopes | Tamper Evident Security With Peel & Seal Pressure Sensitive Closure | Built-In Corner Protection | White | 100 Per Case | 7" x 9" **Brand:** stayflats **Price:** € 58.66 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Stayflats Plus Mailers | Rigid Shipping Envelopes | Tamper Evident Security With Peel & Seal Pressure Sensitive Closure | Built-In Corner Protection | White | 100 Per Case | 7" x 9" by stayflats - **How much does it cost?** € 58.66 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/88563316-stayflats-plus-mailers-rigid-shipping-envelopes-tamper-evident-security-peel) ## Best For - stayflats enthusiasts ## Why This Product - Trusted stayflats brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Size:7" x 9" - 100 count  |  Color:White The Stayflats Plus Mailer provides tamper evident security with a pressure sensitive closure featuring a tear strip opening. It is easy to fulfill and close. The mailer a strong center-seam construction for maximum rigidity. It eliminates need for cardboard stiffeners and keeps product flat during shipping. Environmentally responsible and 100% recyclable. Ideal for photographs, diplomas, awards, calendars, medical records, legal forms. ## Features - ✔ TAMPER EVIDENT SECURITY: Stayflats Plus envelope mailers have a Peal & Seal pressure sensitive closure which protects your package from tampering during delivery. These envelopes аrе easy to fulfill and close. - ✔ RIGID AND STRONG CONSTRUCTION: The Stayflats Plus envelope mailers eliminate the need for cardboard stiffeners. They are designed with a strong and rigid center-seam which protects your documents and keeps them flat during delivery. - ✔ PROTECTED CORNERS: The corners of your documents are now safe thanks to our Built-In corner protection design. No need to worry about jagged or torn edges. Your documents will arrive in the same condition as you sent them. - ✔ EASY OPENING: This design comes with a tear strip which provides quick, easy and frustration free opening experience for the end user. - ✔ IDEAL FOR: Documents, Photographs, Diplomas, Awards, Calendars, Medical Records, Legal Forms and other bend-sensitive items. ## Images ![Stayflats Plus Mailers | Rigid Shipping Envelopes | Tamper Evident Security With Peel & Seal Pressure Sensitive Closure | Built-In Corner Protection | White | 100 Per Case | 7" x 9" - Image 1](https://images-na.ssl-images-amazon.com/images/I/31bI7mbF1YL.jpg) ![Stayflats Plus Mailers | Rigid Shipping Envelopes | Tamper Evident Security With Peel & Seal Pressure Sensitive Closure | Built-In Corner Protection | White | 100 Per Case | 7" x 9" - Image 2](https://images-na.ssl-images-amazon.com/images/I/41P8bifGmiL.jpg) ![Stayflats Plus Mailers | Rigid Shipping Envelopes | Tamper Evident Security With Peel & Seal Pressure Sensitive Closure | Built-In Corner Protection | White | 100 Per Case | 7" x 9" - Image 3](https://images-na.ssl-images-amazon.com/images/I/41q7lYqfsXL.jpg) ## Available Options This product comes in different **Color, Size** options. ## Customer Reviews ### ⭐⭐ NOT 28PT CARDBOARD *by H***Y on October 12, 2018* I ordered these (in kraft) because in the product questions, the manufacturer stated they were made of 28pt cardboard. I bought these to replace my other 28pt mailers in the same size (9.75x12.25) from a different manufacturer because of inconsistent products with my other manufacturer, and when these arrived, I could immediately tell they were nowhere near as stiff. I weighed these and they were only 2.7oz vs 3.5oz for my normal 28pt mailers, which is a huge difference. Judging from the product weights in the listing, the white mailers in the same size, which are considerably more expensive, are actually 28pt, but the kraft ones are considerably lighter and are not.My old mailers were very reliable and would only need one piece of cardboard stiffener when mailing prints, but these would definitely need two. The corners in my old mailer were also practically indestructible, and these corners are very flimsy.However, I do give props to Stayflats for sending all their mailers in boxes that can handle the weight and don't break apart in transport (which has happened to me every single time with every other manufacturer), and their mailers come with no funny smell (also happens a lot with other sellers). The middle seam design is also something I prefer in my flat mailers that not every seller provides consistently.If these were actually more heavy duty 28pt mailers, they would easily be a 5 star product. But I don't know if I can use these for my business without worrying about my products being damaged in the mail. I'm honestly very disappointed because I thought I had finally found the one in terms of flat mailers. ### ⭐⭐⭐⭐⭐ Five Stars *by N***N on July 2, 2018* Love these! Just what I needed. Stiff, nice size, easy to close. ### ⭐⭐⭐⭐⭐ Good for mailing photos *by W***Y on November 7, 2018* I mail a lot of photos and these mailers are perfect for photos printed on 8.5 x 11 photo paper. --- ## 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.pt/products/88563316-stayflats-plus-mailers-rigid-shipping-envelopes-tamper-evident-security-peel](https://www.desertcart.pt/products/88563316-stayflats-plus-mailers-rigid-shipping-envelopes-tamper-evident-security-peel) --- *Product available on Desertcart Portugal* *Store origin: PT* *Last updated: 2026-10-21*