Large Letter Boxes

Large letter boxes for sending via Royal Mail and other postal services. Our range of large letter boxes are designed to fit through the large letter size slot which is a maximum of 353 mm x 250 mm x 25 mm. Large letter size boxes are great for sending a whole range of small items and online orders. Use our large letter postal boxes to send cosmetics, gifts, photo frames, samples, books, and many other items that are small or flat. Most of our large letter size boxes are manufactured here in the UK from corrugated cardboard that offers a strong and sturdy mailing box. They are fully recyclable and biodegradable as well as using a high level of recycled fibre in the cardboard. Our range of large letter boxes come in different sizes including C4 large letter boxes & C5 large letter boxes.

Custom Large Letter Boxes

We offer a range of options for custom large letter boxes. Personalise our range of large letter boxes with your logos and brand message in your brand colours. We offer custom sized large letter boxes, bespoke printed large letter boxes, and coloured large letter boxes to match your brand colours. To find out more about personalising large letter boxes get in touch with our design team by clicking the link above.

FAQs about Large Letter Boxes

What are Large Letter Boxes?

Large letter boxes are postal boxes that fit within the Royal Mail Pricing in Proportion (PiP) criteria for a large letter. The maximum size a large letter box can be is 353mm x 250mm x 25mm, and also must be under 750g (0.75kg) in weight.

Are Large Letter Boxes available with a Self Seal Strip?

Yes, large letter boxes are available with a self seal strip to seal the box closed. A peel & seal glue strip is much easier to use to seal small boxes like this than tape or stickers because it is less fiddly and gives a better seal.

What sort of items fit in a Large Letter Box?

Typical items that would fit in a large letter box are items like A4 documents, certificates, magazines, CD or DVD in case, large greeting cards, photo frames.

Can you buy Large Letter Boxes in Bulk Wholesale?

Yes, you can purchase large letter boxes in bulk pallet quantities at wholesale prices. Buying large letter boxes in bulk is the most cost effective way of purchasing them.

Can Large Letter Boxes be Personalised?

Yes, large letter boxes can be personalised with several different printing processes. They can be custom printed with logos and brand messages in your brand colours as well as being made in a bespoke size to fit your products.
Tufpac 249mm x 352mm Large Letter Cardboard Envelopes (Box of 100)
A Maximum large letter envelope made from strong and stiff solid cardboard that can be used to send books and a range of online orders via Royal Mail as a Large Letter.
£ 36.53 £ 36.53 36.53 GBP Add to Cart
345 x 245 x 20mm Brown Royal Mail Large Letter PiP Mailer with Self Seal
A good quality strong large letter PiP box manufactured from brown corrugated cardboard with a self seal strip.
£ 0.40 £ 0.40 0.4 GBP Add to Cart
C4 Large Letter Box 335 x 245 x 20mm Tufpac® White C4 PiP Boxes
A white C4 PiP Postal Box in the Maximum Size for Royal Mail Large Letter with a peel & seal closure strip - from just 34.3p each.
£ 0.49 £ 0.49 0.49 GBP Add to Cart
Large Letter 330mm x 160mm x 20mm Tufpac® PiP Postal Carton
Large Letter PiP Boxes for sending via Royal Mail with Peel & Seal Closure - from just 32.3p each.
£ 0.46 £ 0.46 0.46 GBP Add to Cart
C5 Large Letter Box 260 x 160 x 20mm Tufpac® White C5 PiP Box
White C5 Large Letter PiP Postal Carton with peel & seal closure & frustration free tear open strip - from just 25p each.
£ 0.42 £ 0.42 0.42 GBP Add to Cart