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Sizes, inserts, print & more
UK Trade Supplier
Tailored pricing on all orders
More than 25 years experience
Cardboard Postal Boxes
Manufacture / trade supply of packaging to Royal Mail guidelines
This small postal packaging allows your business to reduce postage costs, by not exceeding Royal Mail PIP (Pricing in Proportion) guidelines for the large letter boxes category – 353 x 250 x 25 mm (L x W x D).
GWP Packaging manufacture your large letter boxes to your specific requirements – having taken this approach for nearly 30 years. This allows for bespoke sizes, carefully chosen material and tailored pricing, ensuring you benefit from the most cost effective option. Read More
Detailed info on Large Letter Boxes
In 2013, the Royal Mail changed the way in which priced specific sizes of parcels and letters. Known as pricing in proportion, this meant to benefit from specific price bands, your business’ packaging had to fall within pre-defined dimensions / weights.
The large letter boxes as they have become known, must not exceed 353 x 250 x 25 mm (length x width x depth), and have a maximum weight (including packaging and contents) of 0.75 Kg.
As such, your business can source a range of corrugated packaging from GWP which satisfies these requirements.
However, you do not simply need to specify this maximum size. You can choose any size within this range to create a better, tailored fit for your specific products, enhancing the level of protection in transit. It can also help reduce costs by eliminating or minimising any void fill required too.
They can also be created in a range of styles, from pizza style boxes (also referred to as 0427) to 5 panel wraps which fold around your products. If you are unsure of the best design for your application, a member of the GWP team will be happy to advise.
Whatever style you select will be easy, quick and efficient to assemble, and supplied flat packed to minimise storage requirements.
Finally, besides choosing a bespoke size and / or style, you can also choose a natural, eco-friendly kraft brown finish, or a more premium white cardboard appearance. When coupled with a range of one, two or full colour print – that can be applied to the exterior or interior of your large letter boxes – it means you can perfectly match your brand identity.
Whatever options you decide are best for your business, any large letter boxes supplied will use a thin, lightweight yet durable single flute corrugated material. This allows the packaging to maximise the available space of the PIP box guidelines, but also keep the contents safe, secure and free from damage.
All of this makes the large letter cardboard boxes ideal for a range of applications. Any business or ecommerce site selling books, DVDs, computer software or similar sized items could potentially see lower shipping costs as a result of switching to this packaging.
Key features of these boxes at a glance
Large Letter Box technical details
Please use the tables below for the important sizes / weights etc. for these Royal Mail Large letter boxes.
Max External Sizes
Weights / Charges
|0.75 Kg (max)|
Kraft / White
Customisation / Options
Print, specialist coatings and more
If you need to enhance your large letter boxes to improve performance, appearance or security, then GWP can help.
You can choose from numerous print options, a range of specialist coatings (including adding water resistance) as well as tamper evident seals engineered directly into your company’s boxes.