Large Letter Boxes

Large letter boxes for sending via Royal Mail and other postal services. Our range of large letter postage 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 packaging come in different sizes including C4 large letter boxes and C5 large letter boxes.

Royal Mail PiP Size Guide

Self Seal Large Letter Postal Boxes

A range of self seal large letter postal boxes with peel & seal glue strips covered with silicon quick release backing paper. These quick seal large letter boxes are quick and easy for online stores to ship small web orders via Royal Mail postage service. PiP postal boxes in the large letter size with self seal closure are very popular for packing subscription orders fast and efficiently. You can use these small postal boxes to speed up your order packing and reduce costs by keeping the mailing pack within the Royal Mail large letter guidelines which are a maximum size of 353 mm x 250 mm x 25 mm and a maximum weight of 750 grams.

Large Letter Size Packaging

There are other packaging items as well as boxes that can be used to send parcels within the large letter criteria that Royal Mail have set in their Pricing in Proportion program. Other popular packaging items that companies use include A4 envelopes, maxi large letter board envelopes, large letter size padded bags, C4 mailing bags, large letter size poly mailers, and gusseted envelopes up to 25mm thick.

Large Letter Size Envelopes

Large letter size envelopes are envelopes that will fit through within the large letter criteria in the Royal Mail PiP guidelines. You can send large letter envelopes in the peace of mind that you will not get oversize charges or your parcels will inadvertently incur a small parcel charge. Envelopes that are large letter size are used by a wide range of companies that send out small items and want to save money on postage.

Large Letter Size Mailing Bags

Using large letter size mailing bags are important to help reduce and control postage costs. By choosing a large letter size postal bag you have the peace of mind that you won't get over charged when sending your parcels via Royal Mail.

Large Letter Size Bubble Mailers

Our large letter size bubble mailers are a bubble lined envelope that fit within the Royal Mail large letter postal size. Bubble mailers are a padded envelope that can be used to ship many different items via the postal system. By using bubble mailers that are designed to fit within the large letter size criteria you will control your postage cost.

Slimline Ecommerce Postal Boxes

These slimline postal boxes are ideal for keeping your postage costs to a minimum while shipping ecommerce orders or subscription boxes. These thin postal boxes are a maximum of 25mm thick, and are delivered flat pack in a popular 0427 style for quick and easy packing. Courier packs like these make sending postal orders very efficient and are secure for trouble free shipping.

Frequently Asked Questions 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, Royal Mail 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.

Custom Large Letter Boxes

We offer a range of options for custom large letter boxes. Personalise our range of large letter size postage 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 to discuss your custom large letter box ideas.

More Custom Large Letter Box Ideas

Small PiP Box 170 x 100 x 21mm Brown Large Letter Postal Box £ 0.20 ~~£ 0.20~~ 0.2 GBP An A6 size large letter box for packing items up to 170 x 100mm with a 21mm thickness. Large letter postal boxes are small cardboard boxes that fit through the Royal Mail large letter slot and are within the PiP large letter size criteria.	Tufpac 249mm x 352mm Large Letter Cardboard Envelopes (Box of 100) £ 36.53 ~~£ 36.53~~ 36.53 GBP 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.	250 x 340 x 50mm Corrugated Board Envelope (Box of 100) £ 71.96 ~~£ 71.96~~ 71.96000000000001 GBP A postal mailer that will fit within the Royal Mail large letter restrictions. A maxi pip envelope made from strong corrugated cardboard for keeping your items crease free while travelling through the royal mail postal system.	C4 Large Letter Box 335 x 245 x 20mm Tufpac® White C4 PiP Boxes £ 0.49 ~~£ 0.49~~ 0.49 GBP A white C4 PiP Postal Box in the Maximum Size for Royal Mail Large Letter with a peel & seal closure strip. C4 postal boxes that fit through the large letter slot are great for reducing postage costs as they will always ship as a large letter size through the post.
Large Letter 330mm x 160mm x 20mm Tufpac® PiP Postal Carton £ 0.46 ~~£ 0.46~~ 0.46 GBP Large Letter PiP Boxes for sending via Royal Mail with self seal strip. A white large letter box for sending items up to 330mm x 160mm and up to 20mm thick via the postal system. White pip boxes are biodegradable, compostable, and recyclable.	C5 Large Letter Box 260 x 160 x 20mm Tufpac® White C5 PiP Box £ 0.42 ~~£ 0.42~~ 0.42 GBP White C5 Large Letter PiP Postal Carton with peel & seal closure & frustration free tear open strip. C5 large letter postal boxes are a large letter box for items up to 260 x 160 x 20mm, they are designed to post A5 items within the large letter criteria.	225mm x 343mm Jiffy Green Padded Bag Size 4 (Box of 100) £ 75.99 ~~£ 75.99~~ 75.99 GBP PB4 size green mailers with all paper construction for packing items up to 225mm x 343mm. These eco friendly mailing bags are sized to fit within the Royal Mail PiP Large letter guidelines to help reduce mailing costs.	Envosafe F/3 220mm x 335mm White Protect (Box of 100) £ 23.85 ~~£ 23.85~~ 23.85 GBP MM3 size jiffy mailers for posting items up to 220 x 335mm safely and securely through the postal system. This F/3 padded mailer will also fit within the Large Letter PiP guidelines for posting via Royal Mail helping you to save on postage costs.