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Large Letter Postal Boxes

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A presentable, professional and lightweight packaging solution for your posting. Built with a strong sheet of single-wall cardboard, these boxes are easy to assemble without the need for other packaging materials. Also, they are manufactured to adhere to Royal Mails large letter sizes to keep your postage costs down.

The basics:

  • Manufactured to standard FEFCO 0427 design
  • Quick to assemble with an easy folding design, no tape or other sealing equipment is needed
  • Designed to adhere to Royal Mail large letter sizes to save on shipping costs
  • Made from strong E flute single wall corrugated cardboard
  • Manufactured in the UK using recycled materials and 100% recyclable
Want same day dispatch? Order in the next:

Orders received before 3pm on a Friday will be dispatched same-day for delivery on the following Monday. Orders received after 3 pm on Friday will be dispatched on the following Monday, using a next working day delivery service.

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Length x Width x Height (Internal)

Units Per Pack
Unit price from
  • Unit
  • Pack
1-4 Packs
5-10 Packs
11-19 Packs
20-39 Packs
40+ Packs
Enter no. of units
C4 324 x 229 x 20mm
No. of Units:
C5 229 x 162 x 20mm
No. of Units:
C6 162 x 114 x 20mm
No. of Units:

Large Letter Postal Boxes

Whether you’re posting a special package, moving house, storing goods, or looking for industry solutions for all your shipping needs, Smith Packaging hits the standard every time. As an industry expert in all e-commerce packaging, industrial packaging, and personal packaging, we offer everything from the largest box to the smallest envelope. With an eco-friendly ethos and no minimum order, you can pack with complete confidence.

What Are Large Letter Postal Boxes?

The perfect choice for e-commerce stores or if you’re sending letter-size friendly treats to someone you love, the large letter postal boxes get top marks every time. Designed to adhere to the Royal Mail standard of large letter sizes, this savvy postal box can cut costs without cutting corners. For e-commerce packaging, you want a box that is lightweight and tight without being susceptible to damage. This is where our large letter postal boxes come in.

Why They Make Great E-commerce Shipping Boxes

Created from strong and supremely durable E flute single wall corrugated cardboard, this box can be quickly and easily assembled, and doesn’t require any tape or additional items to keep it secure (although if you need some, you can buy tape right here). A professional finish that fits through a letterbox means no fuss and no extra cost, leaving your customers fully satisfied.

What Fits Inside a Large Letter Postal Box?

Large letter postal boxes are perfect for smaller items sent in e-commerce shipping boxes as you don’t need to worry about arranging secure delivery or excess postage fees. They are popular for everything from sending secure documents to expensive items like phones and tablets. You can send books, letters, jewellery, and any other precious things that need to go through a personal postbox. These boxes are also a great slimline size for small t-shirts and socks.

Easy To Personalise

Our large letter postal boxes can be easily customized for that flash of personal brand beauty. Once the box arrives, you can jazz it up with your own packaging label, stamp, or dress the inside up with colourful tissue paper and all those small details to make a customer delight in their package.

Large Letter Postal Boxes from Smith Packaging

Our e-commerce cardboard boxes and large letter postal boxes are made in the UK from recycled materials and are 100% recyclable themselves. For brands that want to put a sustainable foot forward and raise their profile as an eco-friendly company, our sustainable packaging is a great way to go. Buy Large Letter Postal Boxes with us today.

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