Cardboard Envelopes – Premium Corrugated – 278x400mm

Our cardboard envelopes (278x400mm) are gusseted which enables them to act as a small parcel postal box when larger items are inserted into them. These premium corrugated cardboard envelopes are built for strong, heavy duty use and offer great protection to products contained within. Designed with a micro F flute feature, these cardboard mailers are puncture-resistant to protect your goods in transit but come with an easy open tear strip.

The 278x400mm premium corrugated cardboard envelope is designed for heavy duty mailing loads. If you are sending light to medium duty items, then our standard solid board cardboard mailers may be more suitable and cost effective. Click here to view our 278x400mm standard solid board cardboard mailers & envelopes.

Pricing in Proportion (PiP) Sizes

Our cardboard envelopes can be identified using Royal Mail’s Pricing in Proportion index. Our 278x400mm sized cardboard envelope specifically fall into the Royal Mail ‘Small Parcel’ category.

Key features of our 278x400mm premium corrugated cardboard envelopes

• Our 278x400mm cardboard envelope adhere to Royal Mail’s PiP guidelines, so you can accurately calculate your postage costs.
• For added flexibility, strength and protection, our premium corrugated cardboard envelopes come with a puncture-resistant micro F flute and have a strong peel & seal closure.
• Scored for increased capacity – up to 40mm.
• Made from recyclable material.

Product Details

• Colour: Brown.
• Flat Dimensions (width x length): 278x400mm / 27.8x40cm.
• Load Dimensions (width x length x height): 238x360x40mm / 23.8x36x4cm.
• Weight Per Mailer: 0.102 Kg.
• Pack Sizes: Pack of 10, 25, 50, 75, 100, 200, 300, 500, 1000 & 2000.
• PiP Size When Flat: Small Parcel.
• PiP Size When Expanded: Small Parcel.
• Board Grade: F micro-flute.
• For size guidance only this would replace the Kite Packaging code: CFM278400M.
• Mailcoms SKU: MCP-PC-CE278.

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 10–20mm. If precise sizing is important for your project, we strongly recommend requesting a sample before placing your order.