# Centre-lock mailer 300×220×100 template & dieline

> Centre-lock mailer 300×220×100 dieline (DM-CENTRE-LID-MAILER-01). Set your size and fold it in 3D free; download PDF, SVG or DXF with Pro.

Canonical: https://dielinemaker.com/dielines/centre-lid-mailer--centre-lid-medium

The everyday online-order box with two lids meeting at the centre. A ready-sized preset of the centre-lock double-lid mailer. Change the length, width, height, board and options in the editor; the dieline and the 3D preview follow each change.

## Default size

- Inside size: 300 × 220 × 100 mm
- Outside: 311.2 × 223.2 × 103.2 mm
- Flat blank: 717.6 × 674.7 mm
- Manufacturing (score to score): 309.6 × 221.6 × 101.6 mm

## Specifications

| Specification | Value |
| --- | --- |
| Reference | DM-CENTRE-LID-MAILER-01 |
| Family | Mailer |
| Inside size | Length 300 · Width 220 · Height 100 mm |
| Size range | Length 150–600 · Width 80–450 · Height 20–150 mm |
| Parts | One blank |
| Board area | 0.324 m² |
| Default board | E-flute white / kraft (1.6 mm caliper) |
| Board options | E-flute kraft / kraft, E-flute white / kraft, B-flute shipping, F-flute micro corrugated |
| Good for | parcel, ecommerce, shipping, unboxing, centre lock mailer, center lock mailer, double lid mailer, split lid mailer, two lid flaps, self-locking mailer |

## Before you choose this template

### Will the centre-lock mailer 300×220×100 dieline fit my product?

The everyday online-order box with two lids meeting at the centre. The default dimensions in inside-size mode are Length 300 mm, Width 220 mm, Height 100 mm. Measure your product and any inserts or wrapping, then set the template size. Check a physical sample with your contents before ordering production.

### Can I change the size and design?

Yes. The supported ranges are Length 150–600 mm, Width 80–450 mm, Height 20–150 mm. At the default settings, the editor also exposes Lock tongues, Lock tongue width, Lock tongue depth. Add your own artwork and preview the result in 3D. The template geometry is rebuilt when its dimensions change.

### Which materials can I choose?

The default is E-flute white / kraft (1.6 mm caliper). This structure allows E-flute kraft / kraft, E-flute white / kraft, B-flute shipping, F-flute micro corrugated. Select the stock before checking fit, and ask your converter to confirm the grade and caliper for the intended product.

### Which files can I download?

The template page offers dimensioned PDF, Illustrator (.ai via script), layered SVG and DXF cutting and crease geometry. After adding artwork in the editor, you can export a print-ready PDF and review the bleed, safe areas and dieline layers with your printer.

### Is this dieline free?

Browsing the previews is free, and you can customize the template after signing in with Google. Template and print-file downloads require a Pro or Business plan. The Free plan allows one eligible download every 8 hours; free mockups, renders and videos carry a watermark. See the pricing page for the current plans.

### Can I send the download straight to production?

Use the file as a starting point for a printer or converter review. Confirm the finished dimensions, stock, crease and cutting setup, assembly, bleed and artwork, then approve a physical sample. The 3D preview does not test strength, transit performance or suitability for particular contents.

[Compare plans and downloads](https://dielinemaker.com/pricing)

## Downloads and previews

The dieline downloads as PDF (with dimensions), Illustrator (.ai), SVG (vector, by layer) and DXF (for CAD and cutters). These downloads are part of the Pro and Business plans; the previews below are public.

- Flat preview (PNG): https://dielinemaker.com/dielines/centre-lid-mailer--centre-lid-medium/preview.png
- Folded preview (PNG): https://dielinemaker.com/dielines/centre-lid-mailer--centre-lid-medium/folded.png
- Customize in the editor: https://dielinemaker.com/create?style=centre-lid-mailer&preset=centre-lid-medium
- Open in the 3D Studio: https://dielinemaker.com/studio?style=centre-lid-mailer&preset=centre-lid-medium

## Adjustable in the editor

Beyond the size and board, this structure exposes 3 options; the template and 3D preview follow each change.

- Lock tongues (count)
- Lock tongue width (mm)
- Lock tongue depth (mm)

## The centre-lock double-lid mailer family

The same structure with sizes, boards and options set for a use.

- - [Centre-lock double-lid mailer](https://dielinemaker.com/dielines/centre-lid-mailer) - 300 × 220 × 100 mm · DM-CENTRE-LID-MAILER-01
- - [Centre-lock mailer 200×150×60](https://dielinemaker.com/dielines/centre-lid-mailer--centre-lid-small) - 200 × 150 × 60 mm · DM-CENTRE-LID-MAILER-01
- - [Centre-lock apparel mailer 330×250×80](https://dielinemaker.com/dielines/centre-lid-mailer--centre-lid-apparel) - 330 × 250 × 80 mm · DM-CENTRE-LID-MAILER-01
- - [Centre-lock mailer 400×300×150](https://dielinemaker.com/dielines/centre-lid-mailer--centre-lid-large) - 400 × 300 × 150 mm · DM-CENTRE-LID-MAILER-01

## Similar structures

Other structures built in a similar way, matched on code family, category, closures and proportions.

- - [Front-lock mailer](https://dielinemaker.com/dielines/mailer-front-lock) - DM-FRONT-LOCK-MAILER-01 · 230 × 160 × 70 mm · Mailer
- - [Double-front box with lid](https://dielinemaker.com/dielines/double-front-lid-box) - FEFCO 0426 · 300 × 220 × 100 mm · Mailer
- - [Self-locking box with lid](https://dielinemaker.com/dielines/self-locking-lid-box) - FEFCO 0421 · 300 × 220 × 100 mm · Mailer
- - [Mailer box](https://dielinemaker.com/dielines/mailer-box) - DM-ROLL-END-MAILER-01 · 250 × 180 × 60 mm · Mailer
- - [E-commerce box with tear strip and reseal](https://dielinemaker.com/dielines/fefco-ecommerce-box) - FEFCO 0885 · 300 × 220 × 90 mm · Mailer
- - [Mailer with integral support deck](https://dielinemaker.com/dielines/deck-mailer) - DM-DECK-MAILER-01 · 240 × 160 × 70 mm · Mailer

## Related

- [Mailer templates](https://dielinemaker.com/dielines?category=mailer)
- [Centre-lock mailer 300×220×100 mockup](https://dielinemaker.com/mockups/centre-lid-mailer--centre-lid-medium)
- [How to read a dieline](https://dielinemaker.com/blog/what-is-a-dieline)
- [Inside vs outside box dimensions](https://dielinemaker.com/blog/box-dimensions-inside-vs-outside)
- [All dieline templates](https://dielinemaker.com/dielines)