11 size options

100% recyclable

FSC certified

Customise this product

Flexo Printed Side or Bottom Gusset Mailer Bag

Minimum order quantity: 10,000

Trusted by leading brands for volumes for 10,000 bags and above, our Flexo Printed paper mailer bags come in two styles, the Side Gusset and the Bottom Gusset. Across different sizes, these offer greater volume coverage that envelopes whilst maintaining their strength for domestic and international transit. Easy to pack with single or double peel & seal options, the bags can be customised with double sided print with 1 or 2 colours using the flexo print technique.

  • Made for e-Commerce
  • Free UK delivery
  • 11 sizes
  • Custom printing
  • Flexographic printing

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Key features

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 lot from our suppliers undergoes a quality inspection process before it’s shipped. Any lot 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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