Description
📐 Size Compatibility Table
| Paper / Envelope Size | Standard Dimensions (mm) | Fits Inside Our Mailer (245 × 190 mm) | Example Use |
|---|---|---|---|
| A5 | 148 × 210 mm | ✅ Yes – fits perfectly with protective margin | Ideal for A5 notebooks, brochures, leaflets, and prints |
| C5 Envelope | 162 × 229 mm | ✅ Yes – fits comfortably within the 245 × 190 mm mailer | Suitable for sending A4 documents folded once, letters, or magazines |
| A6 | 105 × 148 mm | ✅ Extra space available | Great for postcards, greeting cards, small stationery items |
| A4 (folded once) | 210 × 297 mm → 210 × 148 mm (folded) | ✅ Yes – folds neatly to A5, fits perfectly | Ideal for letters, invoices, and printed documents |
📦 Expanded Size Compatibility Table
| Paper / Envelope Size | Standard Dimensions (mm) | Fits Inside Expanded Mailer (200 × 145 × 50 mm) | Example Use |
|---|---|---|---|
| A5 | 148 × 210 mm | ✅ Yes – fits neatly when inserted lengthways | Ideal for A5 books, journals, catalogues, and prints |
| C5 Envelope | 162 × 229 mm | ✅ Yes – fits comfortably when oriented diagonally or lengthways | Great for sending A4 documents folded once, letters, or presentation packs |
| A6 | 105 × 148 mm | ✅ Ample space | Perfect for smaller items like greeting cards, accessories, or bundles of stationery |
| A4 (folded once) | 210 × 297 mm → 210 × 148 mm (folded) | ✅ Yes – fits flat with extra room for inserts | Suitable for brochures, folded letters, and marketing materials |
| Small Products / Merchandise | — | ✅ Expandable up to 50 mm depth | Accommodates thicker goods like t-shirts, soft accessories, or boxed items |
Key Features
- Expandable Gusset – holds items with depth such as books, CDs, clothing, or marketing materials
- Peel & Seal Closure – secure and tamper-proof with tear-open strip for a frustration-free unboxing
- 100% Recyclable Kraft Board – environmentally friendly, FSC® certified
- Letterbox Friendly – designed to fit most UK letterboxes, reducing delivery costs and failed deliveries
- Rigid & Protective – crush-resistant for added protection during transit
Common Uses
- Books & Brochures
- DVDs, CDs & Games
- Small Clothing Items
- Printed Catalogues, Stationery & Documents
Bulk Pricing Available
From just £0.19 per unit
Free UK delivery on orders over £100
Eco-Friendly Commitment
Our envelope mailers are made from FSC® certified cardboard and are 100% recyclable — helping you reduce your packaging footprint without compromising performance.
Looking for Other Sizes?
Frequently Asked Questions
Q: Do these mailers meet Royal Mail large letter size?
A: Yes, they’re designed to meet Royal Mail large letter dimensions (check your item thickness).
Q: Are these mailers waterproof?
A: No — these are cardboard-based. For water resistance, consider our padded mailers.
Q: Are samples available to trial?
A: Yes, we do offer a free sample for you to trial size and quality of product, dependent on order quantity.
