A3 Single Wall Adjustable Cardboard Boxes

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Strong single wall corrugated board, available in different size options
White Kraft finish
Extended edges for extra shock resistance
Quick and easy snap-shut closure
Perfect for large, flat items such as calendars, posters, brochures, artwork, and more
Sold in packs, priced per box

Learn more

Find this product on page(s) 68 of the general catalogue

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Pre-scored grooves for flexible protection

Introducing large letter boxes, designed meticulously for securely mailing flat, oversized items and ensuring they arrive undamaged. Perfectly suited for transporting items like calendars, brochures, and artwork, these boxes offer a practical solution for a variety of postal needs, making them a viable alternative to other mailing options like postal cardboard boxes. With their robust construction, they provide added reassurance that the contents will remain in pristine condition throughout transit.

Manufactured from strong single wall corrugated board, these boxes feature a pure white Kraft finish that enhances both strength and aesthetics. An exceptional feature of our large letter boxes is the extended edge shock resistance, which safeguards contents against impacts and mishandling. Available in three convenient external measurements; 430 x 310 x 10, 550 x 430 x 10, and 650 x 450 x 10 (L x W x H), these boxes cater to various requirements.

Each envelope is equipped with a quick retractable tongue-lock closure, ensuring secure shipments. For those seeking extra protection, it is advisable to use vinyl packaging tape for double sealing. Delivered flat-packed, these large envelopes are easy to store and handle, making them a highly practical option for both businesses and individuals.

How to use?

Start by ensuring your postal items are suitable for inclusion in a large letter box.
Store the large letter boxes in a dry environment, laid flat to maintain their integrity.
Assemble the box by folding the sides and securing the quick retractable closure.
Place your items inside and seal the box securely. Consider double sealing with additional tape for enhanced security.
Note that the large letter box is 100% recyclable, therefore can be disposed of responsibly.

Ideal Applications

Mailing promotional materials such as brochures and flyers.
Sending artwork or prints that require protection during transit.
Transporting calendars and oversized documents securely.
Utilised by businesses and individuals needing to post large flat items efficiently.

Product FAQs

What is a large letter box?
A large letter box is specifically designed for mailing larger flat items, ensuring they arrive safely without damage.

Can I post a large letter box through a letterbox?
Yes, they can fit through most standard letterboxes.

Which type of postal box should I choose for the large letter box?
It’s advisable to select a large letter box suitable for the dimensions of your items to ensure a safe fit.

How are these envelopes delivered?
These large letter boxes are delivered flat-packed, packaged in convenient quantities.

Packaging solutions you can rely on

Make your packaging stand out by exploring our range of large letter postal boxes large letter mailing boxes, and similar products, from polythene mailing bags, to jiffy bags and bubble envelopes. With RAJA's over 70 years of extensive experience in high-quality packaging solutions, you can find everything you'll need. Check out other products in our range of envelopes and mailing packaging solutions today!