Free UK delivery

Custom sizing

FSC certified

Mailer Box

From £0.19 per unit

Completely customisable, mailer boxes are designed to safely ship products of all kinds. They're made entirely from FSC certified board which is roadside recyclable, and extra features such as a double peel & seal make returns seamless.

  • Custom sizing
  • FSC certified
  • Soy or vegetable-based inks
  • Custom printing
  • Roadside recyclable
  • Double-sided printing

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Key features

Carbon footprint

See how the carbon footprint of Sourceful’s mailer box compares to a benchmark product.

How is this calculated?

Reduce your carbon footprint by up to 12%

-8% CO2e

Custom sizing

Create custom-sized packaging online with Sourceful. Eliminate waste and reduce your carbon footprint. By reducing void space to half the industry average, you can reduce your total order carbon footprint by up to 8%.

-4% CO2e

Sampling

Visualise and proof your packaging online in Sourceful’s Design Studio and remove the need to order samples. By not sampling you could reduce your total order carbon footprint by up to 4%.

Specification

Understand your entire supply chain

Materials
  1. F0

    FEFCO 0427

    Quick to assemble, FEFCO 0427 has a wide, flat interior surface which is ideal for branding or creating a memorable unboxing experience. FEFCO 0427 is durable in transit with each sidewall constructed from two layers of cardboard, providing excellent crush resistance.
  2. Bk

    Brown kraft liner

    FSC certified, unbleached and uncoated liner paper made from virgin pulp. Brown kraft liner is the most sustainable material to print on for these mailer boxes.
  3. Wc

    White coated liner

    FSC certified, bleached liner paper made from recycled and virgin pulp. It’s then coated with kaolin clay to create a smooth surface for printing. White coated liner offers the best print performance.
  4. Bt

    Brown testliner

    FSC certified and made from 100% recycled fibres, brown testliner is a cost-effective paper used on any non-printed, brown side of a mailer box. This reduces its carbon footprint and cost. Testliner isn’t printed on as colours can appear muted and finer details can occasionally blur because of its high absorption rate.
  5. Wt

    White testliner

    FSC certified and made from 100% recycled fibres, white testliner is a cost-effective paper used on any non-printed, white side of a mailer box. This reduces its carbon footprint and cost. Testliner isn’t printed on as colours can appear muted and finer details can occasionally blur because of its high absorption rate.
  6. E

    E-flute

    E-Flute (1.5-2.0mm) is used for all Sourceful mailer boxes. It has great crush resistance for its weight, provides a flat surface for printing and is easy to fold.
  7. Vi

    Vegetable-based inks

    Made with vegetable oils as their primary base, these inks are designed for high-quality offset printing. More sustainable than solvent-based inks.
  8. Ws

    Water-based sealant

    Applied to every printed side of a mailer box. This is a standard part of the offset printing process to ensure colour consistency and avoid scuffing. Does not impact the recyclability of the box.
  9. Uv

    UV varnish

    Used to highlight printed features or create a high gloss, professional finish over an entire print area. UV varnish also protects colours and reduces the risk of colours running when wet. Mailer boxes with a UV varnish are widely recyclable.
  10. Sp

    Single peel & seal

    One strip of adhesive covered with a fibre-based backing paper. A single peel & seal makes fulfilment fast and helps make your packaging tamper-proof. Adding a peel & seal has minimal impact on your carbon footprint.
  11. Dp

    Double peel & seal

    Two strips of adhesive covered with PET backing paper. A double peel & seal makes fulfilment fast and returns easy for your customers. Adding a peel & seal has minimal impact on your carbon footprint.

Supply chain assurance

A resilient, responsible supply chain

Certifications

We validate all supplier claims and third-party certifications such as ISO, BRC and FSC. And we ensure suppliers adhere to UK and EU laws on chemicals and product components, like UK REACH. This allows businesses to confidently buy high-quality products that align with a net-zero trajectory.

All Sourceful mailer boxes are certified FSC Mix.

Vetted suppliers

We visit and vet every supplier we work with. We use our code of conduct to do this, which defines what we consider to be ethical working conditions. To work with Sourceful, suppliers and their manufacturing sites must meet this code. We then review their practices every year.

Learn more

Quality control

Every order from our suppliers undergoes a quality inspection process before it’s shipped. Any order that fails quality inspection is returned to the manufacturer or reproduced.

For orders manufactured internationally (outside the UK), we follow the Acceptable Quality Limit (AQL) method defined by ISO 2859 - 1.

For orders manufactured domestically (inside the UK), our suppliers perform the quality inspection process which we then verify through spot checks throughout the year.

Learn more

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