Buy our Brown PiP Large Letter Postal Mailing Boxes (344mm x 235mm x 20mm) which are strong, lightweight, simple to assemble and offer a great simple professional packaging solution for all types of ecommerce. Ecommerce retailers buy our single wall Brown PiP (Pricing In Proportion) Large Letter Postal Mailing Boxes if you need your goods to fall in to the Royal Mail's Large Letter category. Our large letter boxes to buy are also available in bulk should you need to buy larger quantities for ecommerce.

All of our professional Royal Mail Large Letter brown cardboard boxes are manufactured from single wall cardboard which comes with a high-quality brown outer and brown inner colour to make parcels uniform and stand out. Based on our own experience, it is important that your products are not just well packaged, but that the cardboard packaging itself is representative of the quality of your products. Our 344x235x20mm sized postal boxes are just one product that is perfect for making the right impression on your customers.

Here at Parcelsend UK, we would always advise customers ordering any of our brown parcel boxes to secure them with clear or brown, high quality packaging tape - all of which can be purchased directly from us. Click here to view our range of packaging tape. Not only will this promote your business brand as more professional, it will add value to your shipped goods improving the overall experience for your customers.

Pricing in proportion (PiP) sizes

All of our cardboard brown postal boxes can be identified using Royal Mail’s Pricing In Proportion index. This Brown PiP Large Letter Postal Box - 344x235x20mm box specifically falls into the "Large Letter" category.

Product Features of our Brown Large Letter Postal Box - 344mm x 235mm x 20mm

• Highly presentable & quick to assemble brown cardboard boxes.
• High quality single wall corrugated boxes, perfect where presentation matters.
• Saves storage space as our 344mm x 235mm x 20mm size parcel boxes are delivered flat-packed.
• Lightweight but sturdy Large Letter cardboard boxes.

Product Details

• Colour - Brown outer & brown inner.
• Internal Dimensions (L x W x H) - 344x235x20mm / 34.4.3×23.5x2cm.
• External Dimensions (L x W x H) - 350x247x22mm / 35×24.7×2.2cm.
• Format - A4+.
• PiP Size - Large Letter.
• For size guidance only this would replace the DavPack code - AELL03.
• Parcelsend UK SKU - MCP-400567-PSUK & MCP-400567.

Please note: branding/barcodes may appear on parts of the cardboard box. Images are for reference purposes only and there may be slight variances to the product supplied.

Due to manufacturer tolerances, actual item dimensions may vary by 10–20mm. If precise sizing is important for your project, we strongly recommend requesting a sample before placing your order.

All of our products are manufactured and dispatched right here in our own UK warehouse, which means we can offer some of the fastest turnaround times in the country. And because everything is produced in the UK (unlike many other providers), you’ll never have to worry about customs delays or surprise charges. Delivery is calculated at checkout based on order value - free over £100, from £6.95 under that or select Next Day delivery upgrade for only £9.95. All orders are shipped flat-packed for maximum efficiency.