Our Pricing in Proportion (PiP) Royal Mail Small Parcel boxes are a reliable, professional option for ecommerce businesses that want their orders to qualify as Royal Mail Small Parcels. Strong yet lightweight, these postal boxes are quick to assemble, arrive flat-packed to save storage space, and give your parcels a clean, consistent look in transit.

All of our PiP Small Parcel cardboard boxes are made from high quality corrugated board to protect your goods during shipping. Whether you’re sending cosmetics, clothing, gifts, bakery items, subscription products or general retail orders, these small parcel sizes offer a secure fit and an easy unboxing experience for your customer.

To get the best performance from your boxes, we recommend sealing them with good quality packaging tape (clear, brown or branded), helping to keep each parcel neat, tamper-resistant and ready for courier handling.

Pricing in proportion (PiP) sizes

All of the boxes below fall into Royal Mail’s Small Parcel category. Choose the closest internal size to your product for the safest, most cost-effective postage.

Key Benefits

• Royal Mail PiP Small Parcel compatible sizes for cost-effective shipping.
• Sturdy single wall corrugated cardboard for reliable protection.
• Lightweight but durable - ideal for daily fulfilment.
• Delivered flat-packed to save storage space.
• Quick to assemble for faster packing.
• Professional finish in brown kraft or white options.

Size Guide – PiP Small Parcel Postal Boxes

Brown PiP Small Parcel Boxes

• 110x100x70mm: Internal size 110x100x70mm – External size 130x105x73mm – E flute 1.6mm – SKU: MCP-PiP110-RM-PSUK, MCP-PiP110-RM & PiP110-RM.
• 152x127x95mm: Internal size 152x127x95mm – External size 175x135x100mm – E flute 1.6mm – SKU: MCP-PiP152-RM-PSUK, MCP-PiP152-RM & PiP152-RM.
• 160x150x75mm: Internal size 160x150x75mm – External size 180x155x78mm – R flute 2.3mm – SKU: MCP-PiP160-RM-PSUK, MCP-PiP160-RM & PiP160-RM.
• 180x120x30mm: Internal size 180x120x30mm – External size 200x125x35mm – R flute 2.3mm – SKU: MCP-PiP180-RM-PSUK, MCP-PiP180-RM & PiP180-RM.
• 222x150x88mm: Internal size 222x150x88mm – External size 242x155x91mm – R flute 2.3mm – SKU: MCP-BSPB-6-PSUK, MCP-BSPB-6 & 222X150X88-BSPB-6.
• 240x160x40mm: Internal size 240x160x40mm – External size 265x163x43mm – R flute 2.3mm – SKU: MCP-PIP24040-RM-PSUK, MCP-PIP24040-RM & PIP24040-RM.
• 240x240x40mm: Internal size 240x240x40mm – External size 260x245x43mm – R flute 2.3mm – SKU: MCP-BSPB-8-PSUK, MCP-BSPB-8 & 240X240X40-BSPB-8.
• 240x240x80mm: Internal size 240x240x80mm – External size 260x245x83mm – R flute 2.3mm – SKU: MCP-BSPB-9-PSUK, MCP-BSPB-9 & 240X240X80-BSPB-9.
• 250x150x100mm: Internal size 250x150x100mm – B flute 3mm – SKU: MCP-PIP250-RM-PSUK, MCP-PIP250-RM & PIP250-RM. (External size not listed.)
• 254x254x63mm (Cake Box): Internal size 254x254x63mm – External size 266x269x70mm – B flute 3mm – Fold-in flaps – SKU: MCP-BSPCB-2-PSUK, MCP-BSPCB-2 & 254X254X63-BSPCB-2.
• 254x254x76mm (Cake Box): Internal size 254x254x76mm – External size 266x269x82mm – B flute 3mm – Fold-in flaps – SKU: MCP-BSPCB-3-PSUK, MCP-BSPCB-3 & 254X254X76-BSPCB-3.
• 254x254x102mm (Cake Box): Internal size 254x254x102mm – External size 266x269x108mm – B flute 3mm – Fold-in flaps – SKU: MCP-BSPCB-4-PSUK, MCP-BSPCB-4 & 254X254X102-BSPCB-4.
• 290x208x95mm: Internal size 290x208x95mm – External size 310x213x98mm – R flute 2.3mm – SKU: MCP-BSPB-10-PSUK, MCP-BSPB-10 & 290X208X95-BSPB-10.
• 295x176x76mm: Internal size 295x176x76mm – External size 317x180x80mm – R flute 2.3mm – SKU: MCP-PIP295-RM-PSUK, MCP-PIP295-RM & PIP295-RM.
• 330x220x150mm: Internal size 330x220x150mm – External size 350x228x156mm – R flute 2.3mm – SKU: MCP-PIP330RM-PSUK & MCP-PIP330RM.
• 340x110x110mm: Internal size 340x110x110mm – External size 363x118x115mm – R flute 2.3mm – SKU: MCP-PiP340-RM-PSUK, MCP-PiP340-RM & PiP340-RM.
• 340x210x50mm: Internal size 340x210x50mm – External size 365x210x50mm – B flute 3mm – SKU: MCP-PIP34050-RM-PSUK, MCP-PIP34050-RM & PIP34050-RM.
• 347x242x19mm: Internal size 347x242x19mm – External size 347x245x22mm – E flute 1.6mm – Peel-&-seal – SKU: MCP-PiP347-RM-PSUK, MCP-PiP347-RM & PiP347-RM.
• 375x255x150mm: Internal size 375x255x150mm – External size 398x260x153mm – R flute 2.3mm – SKU: MCP-BSPB-13-PSUK, MCP-BSPB-13 & 375X255X150-BSPB-13.

White PiP Small Parcel Boxes

• 110x100x70mm: Internal size 110x100x70mm – External size 130x105x73mm – R flute 2.3mm – SKU: MCP-PiP110WH-RM-PSUK, MCP-PiP110WH-RM & PiP110WH-RM.
• 152x127x95mm: Internal size 152x127x95mm – External size 175x135x100mm – R flute 2.3mm – SKU: MCP-PiP152WH-RM-PSUK, MCP-PiP152WH-RM & PiP152WH-RM.
• 160x150x75mm: Internal size 160x150x75mm – External size 180x155x78mm – R flute 2.3mm – SKU: MCP-PiP160WH-RM-PSUK, MCP-PiP160WH-RM & PiP160WH-RM.
• 222x150x88mm: Internal size 222x150x88mm – External size 242x155x91mm – R flute 2.3mm – SKU: MCP-PiP222WH-RM-PSUK, MCP-PiP222WH-RM & PiP222WH-RM.
• 240x160x40mm: Internal size 240x160x40mm – External size 265x163x43mm – R flute 2.3mm – SKU: MCP-PIP24040WH-RM-PSUK, MCP-PIP24040WH-RM & PIP24040WH-RM.
• 240x240x40mm: Internal size 240x240x40mm – External size 260x245x43mm – R flute 2.3mm – SKU: MCP-PiP240WH-RM-PSUK, MCP-PiP240WH-RM & PiP240WH-RM.
• 240x240x80mm: Internal size 240x240x80mm – External size 260x245x83mm – R flute 2.3mm – SKU: MCP-PiP24080WH-RM-PSUK, MCP-PiP24080WH-RM & PiP24080WH-RM.
• 290x208x95mm: Internal size 290x208x95mm – External size 310x213x98mm – R flute 2.3mm – SKU: MCP-PiP290WH-RM-PSUK, MCP-PiP290WH-RM & PiP290WH-RM.
• 340x110x110mm: Internal size 340x110x110mm – External size 363x118x115mm – R flute 2.3mm – SKU: MCP-PiP340WH-RM-PSUK, MCP-PiP340WH-RM & PiP340WH-RM.
• 340x210x50mm: Internal size 340x210x50mm – External size 365x210x50mm – B flute 3mm – SKU: MCP-PIP34050WH-RM-PSUK, MCP-PIP34050WH-RM & PIP34050WH-RM.
• 375x255x150mm: Internal size 375x255x150mm – External size 398x260x153mm – R flute 2.3mm – SKU: MCP-PiP375WH-RM-PSUK, MCP-PiP375WH-RM & PiP375WH-RM.

Brown Replacement Codes (for size guidance only, these replace the Kite Packaging codes)

• CSW110X100X70-BPB2
• CSW152X127X95-BPB3
• CSW160X150X75-BPB4
• CSW180X120X30
• CSW222X150X88-BPB6
• CSW240X240X40-BPB8
• CSW240X240X80-BPB9
• CSW250X150X100
• CSW254X254X63
• CSW254X254X76
• CSW254X254X102
• CSW290X208X95-BPB10
• CSW340X110X110-BPB11
• CSW347X242X19-BPB12
• CSW375X255X150-BPB13

White Replacement Codes (for size guidance only, these replace the Kite Packaging codes)

• CSW110X100X70-PBX2
• CSW152X127X95-PBX3
• CSW160X150X75-PBX4
• CSW222X150X88-PBX6
• CSW240X240X40-PBX8
• CSW240X240X80-PBX9
• CSW290X208X95-PBX10
• CSW340X110X110-PBX11
• CSW375X255X150-PBX13

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.