Medium Parcel Postal Boxes
Medium Parcel Postal Boxes
(Enter qty - price will auto update)
£1.04 inc. VAT each
Product Information
Product Information
Our Royal Mail PiP Medium Parcel cardboard boxes are the ideal solution when you need more capacity than a Small Parcel, while still keeping packaging strong, presentable, and cost-effective. This range includes both single wall and double wall boxes, giving you the right balance of strength and weight depending on what you’re shipping.
All Medium Parcel boxes are delivered flat-packed to save storage space and assemble quickly with packaging tape. The single wall options are perfect for everyday e-commerce packing, while the double wall boxes add an extra layer of corrugated protection for heavier or more fragile items in transit.
Pricing in proportion (PiP) sizes
All of the boxes below fall into Royal Mail’s Medium Parcel category. Choose the closest internal size to your product for the safest, most cost-effective postage.
Key Benefits
- Royal Mail Medium Parcel compatible: all sizes listed fall into the PiP Medium Parcel category
- Single wall & double wall options: choose lightweight everyday boxes or heavy duty protection
- Strong corrugated board: reliable protection for e-commerce, storage, and removals
- Flat-packed delivery: saves storage and arrives ready to assemble
- Quick assembly: folds into shape easily and seals with tape
- Professional brown finish: clean kraft outer and inner for a neat presentation
Size Guide – PiP Medium Parcel Boxes
Single Wall Boxes
- 229x229x229mm: Internal size 229x229x229mm – Board grade: R flute 2.3mm – SKU: MCP-400528-PSUK & MCP-400528
- 254x254x254mm: Internal size 254x254x254mm – Board grade: R flute 2.3mm – SKU: MCP-400590-PSUK & MCP-400590
- 305x229x229mm: Internal size 305x229x229mm – Board grade: R flute 2.3mm – Multiscore: 76mm – SKU: MCP-403168-PSUK & MCP-403168
- 305x305x305mm: Internal size 305x305x305mm – Board grade: R flute 2.3mm – Multiscore: 152mm,229mm – SKU: MCP-400592-PSUK & MCP-400592
- 350x250x170mm: External size 350x250x170mm – SKU: MCP-MCPiP352-PSUK, MCP-MCPiP352-RM & MCP-MCPiP352
- 381x254x254mm: Internal size 381x254x254mm – Board grade: B flute 3mm – Multiscore: 127mm – SKU: MCP-400545-PSUK & MCP-400545
- 457x305x254mm: Internal size 457x305x254mm – Board grade: B flute 3mm – SKU: MCP-400556-PSUK & MCP-400556
- 457x305x305mm: Internal size 457x305x305mm – Board grade: B flute 3mm – Multiscore: 270mm,229mm – SKU: MCP-402070-PSUK & MCP-402070
Double Wall Boxes
- 229x229x229mm: Internal size 229x229x229mm – Board grade: B/C flute 6mm – SKU: MCP-BX-B-229x229x229-PSUK & MCP-BX-B-229x229x229
- 254x254x254mm: Internal size 254x254x254mm – Board grade: B/C flute 6mm – SKU: MCP-BX-B-254x254x254-PSUK & MCP-BX-B-254x254x254
- 305x305x305mm: Internal size 305x305x305mm – Board grade: B/C flute 6mm – SKU: MCP-BX-B-305x305x305-PSUK & MCP-BX-B-305x305x305
Product Details
- Material: Single wall or double wall corrugated cardboard (size and style dependent)
- Colour: Brown outer & brown inner
- Delivery format: Flat-packed
- PiP size: Medium Parcel
- Board grades: R flute 2.3mm, B flute 3mm, or B/C flute 6mm (size and style dependent)
- For size guidance only this would replace the Kite Packaging codes: CSW090909, CSW101010, CSW120909M, CSW121212M-P30, CSW151010M, CSW181210, CSW181212M_P30, CDW101010, CDW121212M, CDW121212M-P30, CDW090909
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
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Frequently Asked Questions
What sizes are available in this Medium Parcel box range?
This range covers nine internal sizes, from 229 x 229 x 229mm up to 457 x 305 x 305mm (width x depth x height), all designed to fall within Royal Mail's Medium Parcel category, up to 610 x 460 x 460mm.
What's the difference between single wall and double wall boxes?
Single wall boxes use R flute (2.3mm) or B flute (3mm) board for everyday e-commerce packing, while double wall boxes use B/C flute (6mm) board for an extra layer of protection on heavier or more fragile shipments.
What colour are these boxes?
All boxes in this range have a brown kraft outer and brown inner for a clean, professional presentation.
How are the boxes supplied and assembled?
They're delivered flat-packed to save storage space and fold together quickly, sealing with tape once loaded.
Do dimensions vary slightly between boxes?
Due to normal manufacturing tolerances, dimensions may vary by around 10-20mm, so if precise sizing matters we recommend ordering a sample before a bulk order.
How quickly can I get these boxes?
These Medium Parcel boxes are UK-stocked and 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.
