White C3 / A3 Board Backed Envelopes 457mm x 324mm — Bulk Rigid White Mailers x 8300

White C3 / A3 Board Backed Envelopes 457mm x 324mm — Bulk Rigid White Mailers x 8300

£1,272.00 Inc VAT: £1,526.40

SKU: BBENV-C3-WH#2000 Categories: ,

Description

Deliver your largest flat media with confidence using our White C3 / A3 board backed envelopes — premium hard backed envelopes built for high protection and professional presentation. This listing is for bulk quantities, ideal for art studios, print houses, galleries, architects, and any business mailing large-format content in volume.

Features & Construction

  • Size: 457 mm × 324 mm (18″ × 12.75″ approx) — large enough to accommodate A3 or C3 sized material flat without folding.

  • Materials: 115 gsm paper shell over 950 micron / ~650 gsm rigid board backing for high stiffness and durability.

  • White finish: Crisp white exterior offers a clean, professional appearance in contrast with standard kraft envelopes.

  • “Please Do Not Bend” print: The envelope is printed with this handling instruction in red to encourage careful handling during transportation.

  • Bulk packaging options: Available in multiple quantities (e.g. 50, 100, 250, 500, 1,000, 2,000) to suit high-volume mailing needs.

  • UK-manufactured & recyclable: Made domestically to reduce import miles, with materials designed to be recyclable.

What Fits Inside & Use Cases

Thanks to its robust structure and generous size, White C3 / A3 board backed envelopes are ideal for mailing:

  • A3 prints, artwork, posters, drawings (flat, no folding required)

  • Mounted prints or mounted photos — within thickness constraints

  • Architectural plans, maps, large renderings

  • Presentation portfolios, large certificates, diplomas

  • Multi-sheet sets or magazines / brochures in A3 layout

  • Large-format promotional packs or sample sheets

The rigid board backing ensures that even delicate or stiff items stay flat, resisting bending, creasing or postal damage.

Why Purchase in Bulk

  1. Lower cost per unit — bulk orders significantly reduce your cost per envelope

  2. Reliable stock availability — ensures you always have enough for large mail runs

  3. Uniform product quality — every envelope meets the same protective standard

  4. Greater operational efficiency — easier to store, pack, and dispatch in volume

Benefits to Your Branding & End Customers

  • High-level protection: The stiff board core maintains structural integrity under shipping stress

  • Professional impression: Recipients receive pristine, flat items — reinforcing trust in your brand

  • Large-format capability: Enables sending A3 or equivalent content without folding or tubes

  • Bulk-readiness: Designed to support business-scale mailing with consistent supply

  • Eco & local conscious: UK manufacture reduces carbon footprint and supports sustainable practices

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