> For the complete documentation index, see [llms.txt](https://help.openletterconnect.com/olc-help-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://help.openletterconnect.com/olc-help-docs/product-and-order-guide/products-and-specs/tri-fold-self-mailers.md).

# Tri-Fold Self-Mailers

**Tri-Fold Self-Mailers provide a compact yet content-rich format, perfect for campaigns that require more storytelling or multiple offers.** With three panels (six sides total), these mailers fold down to a convenient size but **expand to showcase detailed information, images, and calls to action.**

### Tri-Fold Self-Mailer Specs

| **Feature**       | **Details**                           |
| ----------------- | ------------------------------------- |
| **Flat Size**     | 9" x 12" (folded to 4" x 9")          |
| **Paper Type**    | Premium Cardstock (16pt C1S)          |
| **Sealing**       | Glue tabbed (edge-sealed for mailing) |
| **Postage Class** | First-Class Mail (1-5 business days)  |

<figure><img src="/files/qZgbFCCKGoZctF9vJJ8S" alt="" width="487"><figcaption></figcaption></figure>

<figure><img src="/files/DY7MXQMEq0N70PCf34PC" alt="" width="485"><figcaption></figcaption></figure>

### Why Tri-Fold Self-Mailers Work

* **Six-panel space:**\
  Allows for a **natural narrative flow**, perfect for **product catalogs**, **step-by-step offers**, or **educational content**.
* **Compact and sleek:**\
  Folds down to **4” x 9”**, fitting neatly into mailboxes while **unfolding into a full-page spread**.
* **Envelope-free, but secure:**\
  Sealed at the edges, maintaining privacy and integrity while **saving on envelope costs**.

### Best Use Cases for Tri-Fold Self-Mailers

| **Use Case**                          | **Why Tri-Folds Work**                                                                    |
| ------------------------------------- | ----------------------------------------------------------------------------------------- |
| **E-commerce Seasonal Catalogs**      | Showcase **multiple products, customer testimonials, and special offers**.                |
| **Real Estate Investor Reports**      | Share **market data, recent deals, and your unique process** in a structured format.      |
| **Local Service Provider Promotions** | Detail **tiered service packages**, **before-and-after images**, and **discounts**.       |
| **Nonprofit Donor Campaigns**         | Explain your **mission, impact, and donation options** in a compelling, storytelling arc. |

#### Suggested Content Flow:

* **Front Panel (Cover):**\
  Attention-grabbing headline and visual.
* **Inside Left Panel:**\
  Introduction or problem statement.
* **Inside Center Panel:**\
  Solution or service overview.
* **Inside Right Panel:**\
  Social proof (testimonials, reviews).
* **Back Panels:**\
  Offer details, contact info, and a **clear call-to-action** (with a QR code if applicable).

### First-Class Mail Only

Tri-Fold Self-Mailers are shipped via **First-Class Mail**, providing:

* **Estimated Delivery:** 1-5 business days
* **Includes address forwarding & return** if undeliverable

> 💡 **Pro Tip:**\
> Use **dynamic QR codes** to drive recipients to **trackable landing pages** or **custom offers**.

### Common Mistakes to Avoid

* **Neglecting fold alignment:**\
  Ensure that **text and images align across folds,** especially where panels meet.
* **Overcrowding each panel:**\
  **White space is your friend.** Use it to separate content blocks and guide readers through the mailer.