Our brown single walled cardboard boxes are a lightweight, reliable choice for everyday e-commerce fulfilment, storage, and postal use. Designed to be strong yet economical, these boxes provide dependable protection for a wide variety of goods while keeping packaging weight and postage costs low.

Each box is made from high quality single wall corrugated cardboard with a clean kraft finish inside and out. All sizes are delivered flat-packed to save storage space and assemble quickly with standard packaging tape. Many of the sizes in this range align with Royal Mail’s Pricing in Proportion (PiP) categories, helping you maximise what you can send as either a Small Parcel or Medium Parcel, depending on the box size.

Key Benefits

• Strong single wall board: ideal for daily packing and posting
• Lightweight & cost-effective: helps keep postage costs down
• Flat-packed delivery: saves space and stores neatly
• Quick assembly: folds into shape easily and seals with tape
• Royal Mail compatible: sizes fall into Small Parcel or Medium Parcel PiP categories
• Professional finish: brown kraft outer and inner for a clean look

Size Guide – Single Walled Cardboard Boxes

• 127x127x127mm: PiP Small Parcel – Internal: 127x127x127mm – Board grade: B flute 3mm – SKU: MCP-400588-PSUK & MCP-400588
• 152x152x152mm: PiP Small Parcel – Internal: 152x152x152mm – Board grade: R flute 2.3mm – Multiscore: 102mm – SKU: MCP-400524-PSUK & MCP-400524
• 229x229x229mm: PiP Medium Parcel – Internal: 229x229x229mm – Board grade: R flute 2.3mm – SKU: MCP-400528-PSUK & MCP-400528
• 254x254x254mm: PiP Medium Parcel – Internal: 254x254x254mm – Board grade: R flute 2.3mm – SKU: MCP-400590-PSUK & MCP-400590
• 305x229x152mm: PiP Small Parcel – Internal: 305x229x152mm – Board grade: R flute 2.3mm – Multiscore: 102mm – SKU: MCP-402058-PSUK & MCP-402058
• 305x229x229mm: PiP Medium Parcel – Internal: 305x229x229mm – Board grade: R flute 2.3mm – Multiscore: 76mm – SKU: MCP-403168-PSUK & MCP-403168
• 305x305x152mm: PiP Small Parcel – Internal: 305x305x152mm – Board grade: B flute 3mm – SKU: MCP-400537-PSUK & MCP-400537
• 305x305x305mm: PiP Medium Parcel – Internal: 305x305x305mm – Board grade: R flute 2.3mm – Multiscore: 152mm,229mm – SKU: MCP-400592-PSUK & MCP-400592
• 350x250x170mm: PiP Medium Parcel – External: 350x250x170mm – SKU: MCP-MCPiP352-PSUK, MCP-MCPiP352-RM & MCP-MCPiP352
• 381x254x254mm: PiP Medium Parcel – Internal: 381x254x254mm – Board grade: B flute 3mm – Multiscore: 127mm – SKU: MCP-400545-PSUK & MCP-400545
• 457x305x178mm: PiP Small Parcel – Internal: 457x305x178mm – Board grade: R flute 2.3mm – SKU: MCP-400557-PSUK & MCP-400557
• 457x305x254mm: PiP Medium Parcel – Internal: 457x305x254mm – Board grade: B flute 3mm – SKU: MCP-400556-PSUK & MCP-400556
• 457x305x305mm: PiP Medium Parcel – Internal: 457x305x305mm – Board grade: B flute 3mm – Multiscore: 270mm,229mm – SKU: MCP-402070-PSUK & MCP-402070
• 450x350x160mm: PiP Small Parcel – External: 450x350x160mm – Royal Mail maximum Small Parcel size – SKU: MCP-MCPiP453-PSUK, MCP-MCPiP453-RM & MCP-MCPiP453

Product Details

• Material: Single wall corrugated cardboard
• Colour: Brown outer & brown inner
• Delivery format: Flat-packed
• PiP categories: Small Parcel or Medium Parcel (size dependent)
• Board grades: R flute 2.3mm or B flute 3mm (size dependent)
• For size guidance only this would replace the Kite Packaging codes: CSW120906M-P30, CSW060606M, CSW121206, CSW050505, CSW120909M, CSW121212M-P30, CSW181207, CSW151010M, CSW101010, CSW090909, CSW181210, CSW181212M-P30, CSW181207, CSW181210

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.

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.