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.

 

2400 in stock

Buy More Save More

Quantity Discount (%) Price Per Box (inc. VAT)
25 - 274 £0.50
275 - 499 4.76 % £0.48
500 - 2,399 9.52 % £0.46
2,400+ 14.29 % £0.43
FREE 48-hour UK delivery for orders over £100
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