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Extra large expandable cardboard mailer - product features

• A highly versatile and adaptable packaging option.
• Seamlessly transition between a rigid envelope and a spacious box, or any form in between.
• Effortless sealing with the integrated peel & seal, and quick opening with the rip-strip.
• Strong, solid cardboard material provides reliable, lightweight protection for larger items.
• Perfect for businesses needing flexible packaging for larger or bulkier products.
• Customise the fit by adjusting length, width, and depth.
• Expansion of the gussets increases depth, with corresponding adjustments to width and/or length.
• Designed for sending a variety of larger items via postal or courier services.
• Recognised as a capacity mailer, book mailer, or book box.
• Meets Royal Mail's 'Small parcel' size guidelines - details below.
• Environmentally responsible - 100% recyclable through standard recycling streams.

Extra large expandable cardboard mailer - dimensions when flat

• Width: 400mm (16")
• Length: 278mm (11")

Extra large expandable cardboard mailer - dimensions when expanded

• Width: 360mm (14")
• Length: 238mm (9.5")
• Depth (gusset): 40mm (1.5")

Royal Mail Pricing in Proportion sizing - Extra large expandable mailer

This paperboard mailer meets the following sizes on Royal Mail's Pricing in Proportion (PiP) scale:

• Size when flat: Small parcel
• Size when expanded: Small parcel