Preview image
The real blank at this size, folded by the same engine as the studio. The artwork is a sample from a fictional brand — swap in your own in the editor.
DM-CENTRE-LID-MAILER-01Mailer
Centre-lock mailer 400×300×150 dieline
B-flute for heavier orders and bundles. A ready-sized preset of the centre-lock double-lid mailer — change the length, width and height and every panel, tuck and glue flap is redrawn to match.
Inside400 × 300 × 150 mm
Outside422.4 × 306.4 × 156.4 mm
Flat blank1035.2 × 941.9 mm
Download the dielinePro
Sign in to download. Dieline downloads are part of Pro: PDF, Illustrator, SVG and DXF, cut, crease and bleed on separate layers, without a watermark. See plans
- Reference
- DM-CENTRE-LID-MAILER-01
- Inside size
- Length 400 · Width 300 · Height 150 mm
- Size range
- Length 150–600 · Width 80–450 · Height 20–150 mm
- Manufacturing
- 419.2 × 303.2 × 153.2 mm score to score · inside vs outside sizes
- Parts
- One blank
- Board area
- 0.640 m²
- Default board
- B-flute shipping · 3.2 mm caliper
- Board options
- E-flute KE-flute WB-fluteF-flute
- Good for
The flat dieline
Exactly what the downloads contain, drawn from the template at its default size, with a 3 mm bleed. How to read a dieline.
- Crease
- Cut
- Bleed 3 mm
How it folds
The centre-lock mailer 400×300×150 erects in 7 steps, in the order the creases are scored to take. The editor plays the same sequence in 3D and lights each step’s creases on the dieline.
- 1Fold the walls upFront, Back
- 2Fold the corner ears inFront ear, Back ear and 2 more
- 3Fold the walls upLeft end, Right end
- 4Fold the stripLeft end roll, Left end (inside)
- 5Fold the stripRight end roll, Right end (inside)
- 6Close the lidFront lid, Back lid
- 7Tuck the flaps inCentre lock tongue
How the blank is sized
Score-to-score panel sizes of this DM-CENTRE-LID-MAILER-01 blank at the default size, with the formula each one follows. L, W and H are the inside dimensions; T is the board caliper (3.2 mm for B-flute shipping). Change the size or board in the editor and every panel is recalculated.
| Panel | Size (mm) | Formula |
|---|---|---|
| Base | 419.2 × 303.2 | – × W + T |
| Front | 419.2 × 151.6 | – × H + T/2 |
| Back | 419.2 × 153.2 | – × H + T |
| Front ear ×2 | 145.2 × 143.6 | – × H − 2T |
| Back ear ×2 | 145.2 × 143.6 | – × H − 2T |
| Left end | 150 × 303.2 | H × W + T |
| Left end roll | 8 × 296.8 | – × W − T |
| Left end (inside) | 150 × 296.8 | H × W − T |
| Right end | 150 × 303.2 | H × W + T |
| Right end roll | 8 × 296.8 | – × W − T |
| Right end (inside) | 150 × 296.8 | H × W − T |
| Front lid | 419.2 × 150 | – |
| Back lid | 419.2 × 158.9 | – |
| Centre lock tongue | 125.8 × 25 | – |
Adjustable in the editor
Beyond the size and board, this structure exposes 3 options; the template and 3D preview follow each change.
- Lock tonguescount
- Lock tongue widthmm
- Lock tongue depthmm
The centre-lock double-lid mailer family
The same structure with sizes, boards and options set for a use.
Preset
Preset
Preset
Before you choose this template
Size, materials, downloads and production checks.
Will the centre-lock mailer 400×300×150 dieline fit my product?
B-flute for heavier orders and bundles. The default dimensions in inside-size mode are Length 400 mm, Width 300 mm, Height 150 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 B-flute shipping (3.2 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.
Similar structures
Other structures built in a similar way, matched on code family, category, closures and proportions.
Make this centre-lock mailer 400×300×150 yours
Open it in the editor to set your size, drop artwork on each face, check bleed and safe areas, and export print-ready PDF with the dieline on its own layer — or stage it in a 3D scene for a mockup.