postal boxes

Postal boxes are sturdy cardboard boxes made to carry goods safely through the post and through courier networks in the UK. They are shaped to pack quickly, seal firmly and protect the contents from knocks, stacking and handling on the way to the customer. A well chosen postal box also presents the order neatly, so the delivery feels considered from the moment it arrives.

Why postal boxes work for everyday posting

A good postal box does three jobs at once. It protects the product, it keeps the parcel within a sensible size for posting, and it gives the buyer a clean opening experience. When the box is close to the size of the item, there is less movement inside, less void fill is needed, and the parcel is easier to stack and store.

Businesses that post every day often choose postal cardboard boxes in a small range of sizes. A tight size range simplifies packing, reduces the chance of picking the wrong box, and helps the packing team work faster. It also makes stock control simpler, because fewer sizes need to be counted and reordered.

Choosing a size that suits the product

Start by measuring the product after it has been wrapped or placed in its inner pack. Add a small allowance for protective material, then match that total to the internal size of the box. The internal size matters most, because that is the space the product actually occupies.

Flat items such as books, prints and folded garments suit shallow boxes. Taller items such as bottles, jars and gift sets need more depth. If the box is too deep, the item can move and the parcel can feel loose. If the box is too shallow, the lid may bulge and the seal may fail.

Measuring in the right order

Measure length first, then width, then depth. Write the three figures down in that order every time, so the packing team and the box supplier are talking about the same shape. A short trial pack with a sample product is worth the time, because it shows whether inserts, tissue or padding change the fit.

Materials and strength for postal boxes

Most postal boxes are made from corrugated cardboard. The fluted layer inside the board gives strength without adding much weight, which helps keep the parcel light and easy to handle. Single wall board suits light to medium items, while double wall board gives extra crush resistance for heavier goods, fragile items and parcels that travel further.

Kraft board has a natural brown finish and a practical look that suits everyday posting. White board gives a brighter, cleaner surface that suits premium products and printed artwork. Both can be recycled widely in the UK, and choosing board that is easy to recycle helps customers dispose of the packaging responsibly after delivery.

Closures that keep parcels secure

Many postal boxes use interlocking flaps that tuck in without tape, which speeds up packing and gives a tidy finish. Others are sealed with tape for extra security, especially for heavier parcels. A peel and seal strip can be useful for returns, because the customer can reseal the same box without searching for tape.

For fragile goods, the closure is only part of the story. Internal dividers, inserts and paper void fill stop items from moving and from touching each other. A box that holds its shape under stacking protects the contents far better than a box that relies on outer wrapping alone.

When to add extra protection

Add extra protection when the product is glass, ceramic, electronic or easily scratched. Wrap each item separately, keep sharp corners away from the box walls, and fill empty corners so the load cannot shift. Test the packed parcel by tilting it gently. If you hear movement, add fill or choose a closer fitting box.

Ordering postal boxes on a quote basis

Printed and custom sized postal boxes are supplied on a quote basis, so the specification can be matched to the product, the quantity and the finish you need. Sharing the product size, the expected order volume and any artwork ideas at the enquiry stage helps produce an accurate quote and avoids a box that is almost right.

Standard printed boxes are normally produced in 10 to 14 working days after final artwork approval, while corrugated boxes are normally produced in 12 to 15 working days after final artwork approval. These timings are planning guides, not a guaranteed delivery date. For full delivery details, see the delivery information page and ask for a quote through the get a quote page.

Before you choose a service, check the Royal Mail small parcel guide for current size and weight limits, and measure the finished parcel against those limits.

Frequently asked questions

What size postal box should I choose for my product?

Measure the wrapped product, add a small allowance for padding, and choose the smallest box that still closes flat without pressure on the lid. A close fit reduces movement, lowers the amount of void fill needed, and usually gives a neater parcel.

Are postal boxes suitable for Royal Mail posting?

Yes, provided the packed parcel stays within the size and weight limits for the service you choose. Measure the finished parcel, including any outer wrapping, before posting, and check the current limits for large letter, small parcel and medium parcel services.

Can postal boxes be printed with my branding?

Yes. Printed boxes can carry a logo, a simple pattern or a full design on the outside, and in some cases on the inside too. Artwork is checked before production, so colours and placement can be approved in advance.

Are cardboard postal boxes recyclable?

Cardboard postal boxes are widely recyclable through UK kerbside collections in most areas. Remove tape and any non paper inserts before recycling, and check local guidance if the box has a heavy coating or a plastic window.

How do I order custom postal boxes?

Send the product dimensions, the quantity you expect to need, and any print or finish ideas through the quote page. You will receive a quote based on that exact specification, rather than a generic size or finish.