Our FlexHold™ postal boxes are a smarter way to ship smaller items securely and professionally. With built-in FlexHold™ retention, your products stay held in place during transit - meaning no void fill, no rattle, and no extra packing materials. It’s a clean, efficient packaging solution that saves time at the packing bench and delivers a premium unboxing experience for your customer.

Made from strong, fully recyclable cardboard, FlexHold™ boxes help you reduce plastic use without compromising protection. The integrated retention insert flexes around your product, keeping it snug and centred so it arrives in the same condition it left you.

Available in brown kraft and white finishes, each box is ideal for e-commerce orders where presentation matters. All sizes below fit within Royal Mail’s Pricing in Proportion (PiP) Small Parcel category, making them a great choice for cost-effective shipping.

Key Benefits

• No void fill needed: built-in FlexHold™ retention secures items without bubble wrap or fillers
• Stops movement in transit: reduces rattling and impact damage
• Premium unboxing: clean internal presentation that elevates your brand
• Eco-friendly: fully recyclable cardboard with no plastic inserts
• Two colour options: brown kraft or white for your preferred look
• PiP Small Parcel compatible: ship confidently within Royal Mail size bands

Size Guide – FlexHold™ Boxes (PiP Small Parcel)

Brown FlexHold™ Boxes

• FLEX35: Internal size 200x150x35mm – Suitable for items up to 155x110x35mm – External size 225x155x40mm – SKU: MCP-FLEX35-PSUK, MCP-FLEX35 & FLEX35
• FLEX60: Internal size 200x150x60mm – Suitable for items up to 155x110x60mm – External size 225x155x65mm – SKU: MCP-FLEX60-PSUK, MCP-FLEX60 & FLEX60
• FLEX55: Internal size 320x220x55mm – Suitable for items up to 265x185x55mm – External size 350x225x60mm – SKU: MCP-FLEX55-PSUK, MCP-FLEX55 & FLEX55

White FlexHold™ Boxes

• FLEX35WH: Internal size 200x150x35mm – Suitable for items up to 155x110x35mm – External size 225x155x40mm – SKU: MCP-FLEX35WH-PSUK, MCP-FLEX35WH & FLEX35WH
• FLEX60WH: Internal size 200x150x60mm – Suitable for items up to 155x110x60mm – External size 225x155x65mm – SKU: MCP-FLEX60WH-PSUK, MCP-FLEX60WH & FLEX60WH
• FLEX55WH: Internal size 320x220x55mm – Suitable for items up to 265x185x55mm – External size 350x225x60mm – SKU: MCP-FLEX55WH-PSUK, MCP-FLEX55WH & FLEX55WH

Product Details

• Box style: Tuck-In-Flaps
• Colours available: Brown / Manila outer & inner, or White outer & inner
• Retention: Integrated FlexHold™ cardboard insert (no plastic void fill required)
• PiP size: Small Parcel
• Use: Ideal for securely shipping smaller products where presentation matters

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 printed 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.