Postal Lock Mailer - Medium - 230x155x23mm

Postal Lock Mailer - Medium - 230x155x23mm

Be the first to review this product

Excl. Tax: £8.33 Incl. Tax: £10.00


+ -

* Required Fields


Internal Dimensions - 230 x 155 x 23mm

Download PDF template
Download the PDF template for this product. We recomend opening this in Adobe illustrator to drop your artwork in. If you have any questions get in Contact

Turnaround Time - Estimated delivery between Mon 8th July - Wed 10th July

We manufacture all our packaging in our dedicated UK factory. If you are looking for a specific or earlier delivery date get in touch.

Are you looking for a custom design? Our in-house carton design team is happy to help create a bespoke packaging solution.

Bespoke enquiry



Details - Standard Postal Lock Style

Dimensions (mm) Material Print Spec Finishing
230 x 155 x 23mm 500 micron White Board CMYK Full colour 1 side Die-cut & Creased

The Medium size is the most popular postal lock mailer packaging we offer - being both versatile and post ready. The familiar size is used by various subscription box companies such as graze. Ideal for E-commerce shipping looking to delight there customers with a branded box.

Great for delivering pitch collateral or samples via the mail in professional high quality printed packaging. The Postal Lock style offers a securely packed robust mailer that shows off your brand.


Royal Mail Large Letter

These fit through the letterbox and qualify as a Royal Mail Large Letter Format when posted and under 750 grams.

Simple self-assembly

Sent out flat packed - Minimising storage costs and space requirements. Assembled in seconds and ready to fill.

Locking tabs

Two neat die-cut locking tabs have a firm hold and can be re-closed. Without the need for stickers although a tamper evident seal can be a great addition.

Size & Applications

Box size - 230 x 155 x 23mm

These Medium Standard Mailer boxes offer a versatile compact package to delight your customers in a printed package that fits through the mailbox & your brand can be proud of.

  • Multi uses - Suitable for sending smaller items such as snacks, beauty products, subscription packs & jewelry and combine with your preferred packaging material inside.
  • Inviting box - Start your event or conference with a bang! Presenting your tickets in this printed medium sized mailer pack that easily holds tickets and DL compliment slips.
  • Sample Packs - Convert your new prospects with a professionally branded pack to present your samples & swatches.

If you are looking for a different size our postal sizes (small enough to fit through the letterbox) & our parcel sizes (for larger items) or alternatively submit a custom request and get one our cardboard engineers to create a bespoke size for you

Packaging Material

A Solid Packaging Board White Throughout

500 microns Thickness

Fully Recyclable & as FSC Certified board all pulp is sourced from well managed and sustainable sources.

Material is suitable for Cosmetics, Food, Drink and Toy Packaging.

Print Quality

Printed in a Full Colour CMYK print to the outside of mailer box with full coverage

High Quality print giving photo quality results.

Why not order 1 prototype copy to see the finished product before ordering in larger volumes?


Die-cut, Creased & Supplied flat ready for assembly.

Artwork Design

Graphic Design Options

Use our Online Design tool

Click "Use our online design tool" above to use the Woohoop online packaging design tool. Design, preview & approve your design as a 3D proof in minutes.

Upload your Artwork

Alternatively you can design your own artwork offline.

First, download our PDF artwork template (Available above) and drop your artwork in using a design tool (we recommend Adobe Illustrator).

Then click "Upload your artwork as a PDF template" above to Upload & Preview your artwork before ordering your packaging online.

Our Design Services

Our expert packaging designers can handle the graphic design for you

Just send us your design brief and any text, image and logo resources and we will provide a quotation for producing print ready files

Our design services

Bespoke Service

If you can't find what you are looking for we can offer completely bespoke design and production services with custom sizes available just get in contact.

Our bespoke packaging options include:

  • Custom Fitments- We can produce a bespoke platform to hold your product
  • Food Grade Printed Packaging - BRC food grade production is available on request with food grade inks and coatings
  • Specialist Materials - With the ability to use UV inline printing we can print to a wide range of paper and boards.
  • Window Patching and custom apertures - We can produce gift packs with window patches in the size and shape you require.
Book a call-back with Woohoop Packaging