C4 Envelope Mailers 340 x 285 (295 x 240 x 50)mm

£0.50 inc VAT

Protect and deliver your flat and semi-bulky items with our C4 envelope mailers — a cost-effective, eco-friendly packaging solution perfect for ecommerce, retail, and office use.

Flat packed external dimensions: 340 x 285 x 5mm 

Expandable external dimensions: 295 x 240 x 50mm

Not sure if your product will fit?
Check our Size Compatibility Table below to see how these mailers accommodate specific sized items.

 

Out of stock

SKU: ROW313917/A Category:

Description

📏 Flat-Packed Size Compatibility Table

Flat-packed external dimensions: 340 × 285 × 5 mm

Paper / Envelope Size Standard Dimensions (mm) Fits Inside Flat-Packed Mailer (340 × 285 × 5 mm) Example Use
A4 sheet 210 × 297 mm Yes – fits with margin along width Perfect for letters, documents, reports, and brochures
C4 envelope 229 × 324 mm Yes – fits comfortably with protective margin Ideal for sending unfolded A4 documents, certificates, or magazines
A3 (folded once) 297 × 420 mm → 297 × 210 mm Yes – fits lengthwise when folded Suitable for posters or artwork folded once
A5 sheet 148 × 210 mm Yes – plenty of room Brochures, booklets, prints

📦 Expanded Size Compatibility Table

Expanded external dimensions: 295 × 240 × 50 mm

Paper / Envelope Size Standard Dimensions (mm) Fits Inside Expanded Mailer (295 × 240 × 50 mm) Example Use
A4 sheet 210 × 297 mm Yes – fits with depth for multiple sheets Bulk letters, invoices, booklets, small reports
C4 envelope 229 × 324 mm Yes – fits comfortably when oriented diagonally Mailing unfolded documents or certificates
A3 (folded once) 297 × 420 mm → 297 × 210 mm Yes – fits widthwise with margin Folded posters, presentation boards
A5 sheet 148 × 210 mm Ample space available Brochures, small booklets, promotional materials
Bulk Items / Merchandise Expandable up to 50 mm depth Perfect for thicker documents, soft products, or multiple items

Key Features & Benefits

  • Dual-Size Compatibility – Fits standard A4 sheets, A3 folded once, and C4 envelopes, making it versatile for multiple mailing needs.

  • Expandable Depth up to 50 mm – Perfect for thicker documents, multiple sheets, or lightweight merchandise.

  • Durable, Crush-Resistant Cardboard – Provides reliable protection during transit.

  • Tamper-Proof Peel & Seal Closure – Easy to seal securely, with tear strip for safe opening.

  • Eco-Friendly & Recyclable – Made from 100% recyclable cardboard, supporting sustainable shipping practices.

  • Letterbox-Friendly Design – Slim enough for easy posting while keeping contents safe.


Suggested Uses

  • Documents & Certificates – A4 reports, legal documents, folded A3 sheets

  • Marketing Materials – Brochures, magazines, posters, flyers

  • Merchandise & Small Goods – Lightweight items, soft products, promotional bundles

  • Corporate Mailings – Bulk invoices, newsletters, presentation packs


Technical Specifications

  • Flat-packed external dimensions: 340 × 285 × 5 mm

  • Expanded external dimensions: 295 × 240 × 50 mm

  • Material: Fully recyclable, rigid cardboard

  • Closure type: Peel & seal with tear strip for easy opening

  • Bulk discount options: Available on larger orders

  • Dispatch: 2–3 working days from UK stock


Why Choose Weedon Direct?

  1. UK Manufacturer & Stock – Quick dispatch and local support

  2. Eco-Friendly Packaging – Fully recyclable, sustainable materials

  3. Reliable Protection – Designed to withstand postal handling

  4. Flexible Bulk Orders – Discounts available for large quantity purchases


Tips for Best Use

  • Insert items snugly to prevent movement during transit.

  • Use internal cardboard supports for fragile or bulky documents.

  • Seal the peel strip firmly; do not reuse once opened.

  • For thick contents near 50 mm depth, consider extra edge protection.

Additional information

Dimensions 340 × 285 × 5 mm
Quantity per Pallet

2400

FAB mm H

5mm

FAB mm L

340mm

FAB mm W

285mm

FAB Inches H

0.2in

FAB Inches L

13.4in

FAB Inches W

11.2in

Buy More Save More – when ordering in higher volumes!

FREE 48-hour UK delivery for orders over £100