Fully customisable

FSC certified

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Crash Lock Box

Crash lock boxes are one of the quickest types of packaging to assemble. This makes them ideal for packing high volumes by hand and rapid fulfilment, saving time and reducing costs in the process. Often used by e-commerce stores as an alternative to a mailer box.

  • FSC certified
  • Custom printing
  • Custom sizing
  • Rapid fulfilment

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Key features


  1. Materials

    1. F0

      FEFCO 0713

      FEFCO 0713 is a pre-glued box made from one piece of board which is commonly used to improve packing efficiency. Shipped flat and ready to use on arrival.
    2. Bk

      Brown kraft liner

      FSC certified, unbleached and uncoated liner paper made from virgin pulp. Brown kraft liner is a sustainable material that still provides high print performance.
    3. Wk

      White kraft liner

      FSC certified, bleached liner paper made from virgin pulp. White kraft liner is a good option for printing bold colours without choosing a coated paper.
    4. 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.
    5. Bt

      Brown testliner

      FSC certified paper made from 100% recycled fibres, brown testliner is a cost-effective paper often used on non-printed boxes. Testliner can be printed on but we recommend kraft liners for the best print performance.
    6. Wt

      White testliner

      FSC certified paper made from 100% recycled fibres, white testliner is a cost-effective paper. It's used on non-printed sides of certain crash lock mailers, which reduces the carbon footprint and cost of your box. We don’t recommend this paper for printing.
    7. E


      E-Flute (1.5-2.0mm) is widely used for these crash lock boxes. It has great crush resistance for its weight, provides a flat surface for printing and is easy to fold.
    8. B


      B-flute (2.5-3.5mm) is commonly used across boxes of any size. It has good crush resistance and its thickness offers extra cushioning.
    9. Wb

      Water-based inks

      Made with water as their primary base, these inks are designed for flexographic printing. More sustainable than solvent-based inks.
    10. 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.
    11. 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.
    12. Dp

      Double peel & seal

      Two strips of adhesive covered with fibre-based 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.
  2. Production

    1. Op

      Offset printing

      Offset printing is the standard process for high volume, high-quality printing. It's versatile, offers excellent vibrancy and detail, and is ideal for complex designs, bright colours, text and images.
    2. Fp

      Flexographic printing

      Flexographic printing is the most cost-effective printing process for high volumes. It's ideal for printing straightforward designs such as logos or simpler graphics and text, but some finer details can lose resolution in print.
    3. 1p

      1 colour printing

      1 colour printing is the most cost-effective option. Pantone colours ensure consistency for your branding.
    4. 2p

      2 colour printing

      2 colour printing allows for bold, high contrast designs. Pantone colours ensure consistency for your branding.
    5. Fc

      Full colour printing

      Full colour printing (CMYK) is ideal for vibrant, multi-coloured designs and images.
  3. Secondary packaging

    1. Cb

      Carton boxes

      Below a certain size, crash lock boxes may be packed in cardboard carton boxes and stacked onto a pallet. This protects smaller products in transit and allows for more efficient packing, reducing costs and emissions.
    2. P


      The majority of boxes are shipped on standard, UK-sized (1.0x1.2m) pallets to ensure ease of delivery.
    3. Sw

      Shrink wrapping and plastic strapping

      Any corrugated cardboard packaging stacked on pallets is secured with plastic straps to prevent movement during transit. They’re also shrink-wrapped to protect from dust and scratches. This secondary packaging has a negligible effect on a shipment’s carbon footprint and helps ensure products arrive in the best condition.
  4. Transport

    1. D


      All domestic transit (UK) is handled by road. Products produced domestically are typically dispatched and delivered 24-48 hours after production is complete.
  5. End of life

    1. Rr

      Roadside recyclable

      Sourceful boxes are widely recycled at the roadside, but end-users should always check with their local authority.

Supply chain assurance

A resilient, responsible supply chain


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 crash lock boxes can be FSC Mix certified.

Vetted suppliers

We vet every supplier we work with. We do this through site visits and rigorous product testing.

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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.

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