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
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Dual-Size Compatibility – Fits standard A4 sheets, A3 folded once, and C4 envelopes, making it versatile for multiple mailing needs.
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Expandable Depth up to 50 mm – Perfect for thicker documents, multiple sheets, or lightweight merchandise.
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Durable, Crush-Resistant Cardboard – Provides reliable protection during transit.
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Tamper-Proof Peel & Seal Closure – Easy to seal securely, with tear strip for safe opening.
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Eco-Friendly & Recyclable – Made from 100% recyclable cardboard, supporting sustainable shipping practices.
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Letterbox-Friendly Design – Slim enough for easy posting while keeping contents safe.
Suggested Uses
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Documents & Certificates – A4 reports, legal documents, folded A3 sheets
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Marketing Materials – Brochures, magazines, posters, flyers
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Merchandise & Small Goods – Lightweight items, soft products, promotional bundles
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Corporate Mailings – Bulk invoices, newsletters, presentation packs
Technical Specifications
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Flat-packed external dimensions: 340 × 285 × 5 mm
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Expanded external dimensions: 295 × 240 × 50 mm
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Material: Fully recyclable, rigid cardboard
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Closure type: Peel & seal with tear strip for easy opening
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Bulk discount options: Available on larger orders
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Dispatch: 2–3 working days from UK stock
Why Choose Weedon Direct?
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UK Manufacturer & Stock – Quick dispatch and local support
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Eco-Friendly Packaging – Fully recyclable, sustainable materials
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Reliable Protection – Designed to withstand postal handling
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Flexible Bulk Orders – Discounts available for large quantity purchases
Tips for Best Use
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Insert items snugly to prevent movement during transit.
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Use internal cardboard supports for fragile or bulky documents.
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Seal the peel strip firmly; do not reuse once opened.
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For thick contents near 50 mm depth, consider extra edge protection.









