Packaging Tips & Guides
Mailer Box Dieline for Ecommerce – Free Template Generator Guide
Ecommerce brands live or die by their unboxing experience — and the mailer box dieline is the foundation of that experience. A well-designed ecommerce box dieline produces a box that opens beautifully, holds its contents securely, and communicates your brand from the moment it lands on the customer’s doorstep. This guide covers mailer box dielines for ecommerce brands.
What Is a Mailer Box Dieline?
A mailer box dieline is the flat packaging template for a self-locking ecommerce shipping box. Unlike traditional corrugated shipping boxes that require tape, a mailer box locks securely through interlocking flaps — no tape, no glue. When the customer opens it, the experience is clean, intentional and brand-consistent.
Mailer Box Dieline — Key Dimensions
Every mailer box dieline is defined by three dimensions:
- Length (L) — the longest internal dimension
- Width (W) — the shorter internal dimension
- Depth (D) — the internal height of the box
Always measure your product first and add 10–20mm clearance on all sides for inner packaging (tissue paper, inserts, padding).
Standard Ecommerce Mailer Box Sizes
| Size Name | Dimensions (mm) | Best For |
|---|---|---|
| Small | 200 × 150 × 80 | Jewellery, accessories, small cosmetics |
| Medium | 280 × 200 × 120 | Clothing items, folded garments, books |
| Large | 350 × 250 × 150 | Multiple items, larger clothing, shoes |
| XL | 450 × 350 × 200 | Subscription boxes, hampers, bulky items |
Mailer Box Dieline — Material Guide
- 3-ply corrugated (B-flute) — lightweight, standard ecommerce. 3mm thick.
- 5-ply corrugated (BC-flute) — stronger, for heavier or fragile items. 6mm thick.
- Rigid board (2–3mm) — premium, no corrugation. For luxury brands.
- Kraft board (400–600gsm) — for smaller, lighter ecommerce items.
How to Generate a Free Mailer Box Dieline
- Go to Diegen by Aprints.pk
- Select Mailer Box as your box type
- Enter your L × W × D dimensions
- Enter your material thickness (e.g. 3mm for B-flute corrugated)
- Generate and download
- Open in Illustrator or CorelDraw, apply your brand artwork
- Send to your packaging supplier for printing
Mailer Box Design Tips for Ecommerce Brands
- Print the inside too — the first thing the customer sees when opening is the inside of the lid. A branded interior is a high-impact moment for low added cost.
- Add a perforated tear strip — makes opening easier and the experience more satisfying.
- Include a QR code — inside the box lid, linking to your social, review page or a personal thank-you video.
- Match your inner packaging — tissue paper, stickers and inserts that match the box colour create a cohesive, Instagrammable unboxing.
Generate your mailer box dieline free at Diegen by Aprints.pk. Need it printed? Browse our ecommerce box range or WhatsApp us for a custom quote.
