Our double walled cardboard boxes (305x305x305mm) are designed to carry larger, heavier items and loads. This is made possible by our 305x305x305mm heavy duty cardboard boxes being made from two layers of corrugated cardboard which are securely glued together to offer much more protection. If you need to ship large items and want maximum protection during transit then double walled cardboard boxes are what you need.

We not only supply double walled cardboard boxes but we can also supply single walled cardboard boxes. Single wall boxes are not as strong as double wall boxes but they are just as reliable and of a high quality. View our range of single wall cardboard boxes here.

Pricing in Proportion (PiP) Sizes

Our double wall cardboard boxes can be identified using Royal Mail’s Pricing in Proportion index. Our 305x305x305mm sized double wall box specifically fall into the Royal Mail Medium Parcel category.

Key features of our 305x305x305mm Double Wall Cardboard Boxes

• Our heavy duty 305x305x305mm double wall packaging boxes adhere to Royal Mail’s PiP guidelines, so you can accurately calculate your postage costs.
• For added flexibility, strength and protection, these 305x305x305mm double wall boxes are multi-scored.
• These 305x305x305mm boxes are manufactured from two layers of corrugated cardboard for added protection and security. Suitable for heavy items.
• Made from 60% to 90% recyclable material.

Product Details

• Colour: Brown outer & brown inner.
• Internal Dimensions (Length x width x height): 305x305x305mm / 30.5×30.5×30.5cm / 12x12x12 Inches.
• External Dimensions (Length x width x height): 320x320x320mm / 32x32x32cm / 12.6×12.6×12.6 Inches.
• Board Grade: B/C flute 6mm.
• Multiscored: None.
• Pack Size: Pack of 10, 25, 50, 75, 100, 200, 300 & 500.
• PiP Size: Medium Parcel.
• For size guidance only this would replace the Kite Packaging code: CDW121212M.
• Mailcoms SKU: MCP-BX-B-305x305x305.
• Please Note: 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 third-party product names, product codes, product SKU’s and company names are trademarks or registered trademarks of their respective holders. Use of these names or codes does not imply any affiliation with or endorsement by the trademark holder and nor does it suggest any reference or comparison to the quality of our goods vs the quality of the goods of the trademark holder.

Due to manufacturer tolerances, actual item dimensions may vary by 1020mm. If precise sizing is important for your project, we strongly recommend requesting a sample before placing your order.