Large Letter Postal Boxes
Large Letter Postal Boxes
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£1.30 inc. VAT each
Product Information
Product Information
Our Royal Mail PiP Large Letter postal boxes are designed to help you ship orders securely while staying within Royal Mail’s Large Letter size band. Made from strong single wall corrugated cardboard, they’re lightweight, easy to assemble, and give your parcels a clean, professional finish - ideal for e-commerce, retailers, and small businesses sending flatter items.
Each box is supplied flat-packed to save storage space and assembles quickly, making day-to-day packing faster and tidier. With a high-quality kraft finish (brown) or crisp white outer option, these boxes deliver a great first impression while keeping contents protected in transit.
Pricing in proportion (PiP) sizes
All of the boxes below fall into Royal Mail’s Large Letter category. Choose the closest internal size to your product for the safest, most cost-effective postage.
Key Benefits
- Royal Mail PiP Large Letter compatible sizes for cost-effective shipping
- Sturdy single wall corrugated cardboard for reliable protection
- Lightweight but durable - ideal for flatter goods
- Delivered flat-packed to save storage space
- Quick to assemble for faster packing
- Professional finish in brown kraft or white options
Size Guide – PiP Large Letter Postal Boxes
Brown PiP Large Letter Boxes
- 147x138x20mm: Internal size 147x138x20mm – External size 153x150x22mm – Format CD+ – SKU: MCP-400565-PSUK & MCP-400565
- 175x165x22mm: Internal size 175x165x22mm – External size 180x170x23mm – SKU: MCP-PIP175-RM & MCP-PIP175
- 220x206x22mm: Internal size 220x206x22mm – External size 222x207x24mm – SKU: MCP-PIP220LL-RM-PSUK, MCP-PIP220LL-RM & PIP220LL-RM
- 265x220x23mm: Internal size 265x220x23mm – External size 270x222x25mm – SKU: MCP-PIP265LL-RM & MCP-PIP265LL
- 330x220x23mm: Internal size 330x220x23mm – External size 336x223x25mm – SKU: MCP-PIP330LL-RM & MCP-PIP330LL
- 430x219x23mm: Internal size 430x219x23mm – External size 437x222x25mm – SKU: MCP-PIP430LL-RM & MCP-PIP430LL
White PiP Large Letter Boxes
- 147x138x20mm: Internal size 147x138x20mm – External size 153x150x22mm – Format CD+ – SKU: MCP-400570-PSUK & MCP-400570
- 175x165x22mm: Internal size 175x165x22mm – External size 180x170x23mm – SKU: MCP-PIP175WH-RM-PSUK & MCP-PIP175WH-RM
- 220x206x22mm: Internal size 220x206x22mm – External size 222x207x24mm – SKU: MCP-PIP220LLWH-RM-PSUK, MCP-PIP220LLWH-RM & PIP220LLWH-RM
- 265x220x23mm: Internal size 265x220x23mm – External size 270x222x25mm – SKU: MCP-PIP265LLWH-RM-PSUK & MCP-PIP265LLWH-RM
- 330x220x23mm: Internal size 330x220x23mm – External size 336x223x25mm – SKU: MCP-PIP330LLWH-RM-PSUK & MCP-PIP330LLWH-RM
- 430x219x23mm: Internal size 430x219x23mm – External size 437x222x25mm – SKU: MCP-PIP430LLWH-RM-PSUK & MCP-PIP430LLWH-RM
Replacement Codes (For Size Guidance Only)
- Brown 147x138x20mm: replaces DavPack code – AELL01
- White 147x138x20mm: replaces DavPack code – AELLW01
Please note: Dimensions may vary slightly (±10–20mm) due to manufacturing tolerances. A sample service is available for testing prior to bulk orders. 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.
Fast UK Delivery
Fast UK Delivery
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.
Product Reviews
Product Reviews
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Frequently Asked Questions
What sizes are available and are they internal or external?
These boxes are available in six sizes with internal dimensions of 147x138x20mm, 175x165x22mm, 220x206x22mm, 265x220x23mm, 330x220x23mm and 430x219x23mm - external dimensions are a few millimetres larger to allow for the board thickness.
Will these boxes qualify for Royal Mail's Large Letter rate?
Yes, every size in this range is designed to fit within Royal Mail's Pricing in Proportion Large Letter band, up to 353 x 250 x 25mm, helping keep postage costs down.
What material are the boxes made from?
They are made from strong single wall corrugated cardboard, giving a lightweight but durable box that's well suited to flatter items.
What colour options are available?
You can choose a brown kraft finish or crisp white outer, both delivered flat-packed for a quick, professional fold-up.
Do the dimensions vary between individual boxes?
Due to normal manufacturing tolerances, actual dimensions may vary by around 10-20mm, so if exact sizing is critical we recommend ordering a sample first.
How are these boxes delivered and how quickly can I get them?
The boxes arrive flat-packed to save storage space and assemble quickly by hand; as a UK-stocked product they are despatched the same working day when ordered before the daily cut-off.
Why Choose Us
Free UK Delivery Available
Choose from a few delivery options including FREE delivery to mainland UK on orders over £100.
Trusted Supplier
Over 20 years’ experience in the postal industry under Mailcoms Ltd.
UK Based
All products are printed and made in the heart of England, keeping our carbon footprint as low as possible.
