mailer box packaging.

Strong, printed and correctly sized boxes are the foundation of good mailer box packaging. A mailer box is a self locking corrugated carton that folds around a product, protects it through the postal network and opens neatly for the customer. Custom Postal Boxes manufactures mailer boxes in Wolverhampton for UK online sellers, with custom print, low minimum order quantities and free UK delivery.

The elements of mailer box packaging.

A mailer box usually has a hinged lid, dust flaps that keep small items inside and locking tabs or an adhesive strip that close it without tape. The corrugated board gives stiffness and crush resistance at a low weight, which is why the format suits clothing, cosmetics, candles, books, gifts and subscription products that are posted every day.

Good packaging design starts with the product, not the box catalogue. The internal size should hold the product and any insert or wrapping without spare space for movement, and the external size should sit within the postage band you intend to pay for. Every extra centimetre of air inside the box is filler you must buy and space your customer must recycle.

Print inside and outside the box

Outside print carries your logo, colours and handling guidance where couriers and customers see them first. Inside print is revealed on opening, so it suits a thank you message, care guidance, a discount code for a future order or a short story about your brand. Planning both surfaces together gives a joined up presentation rather than a plain interior surprise.

Keeping artwork clear of folds and locks

Keep faces, logos and important text away from creases, locking slots and the lid edge, where print can distort or rub during transit. Free design support includes checking your artwork against the exact cutter template for your box size, so positioning problems are solved before printing rather than discovered at the packing bench.

Sizing, inserts and protection

Choose the smallest box that holds your product safely, then decide whether an insert, tissue or a simple wrap is needed to stop movement and protect surfaces. Our Custom Mailer Boxes UK and Cardboard Mailer Boxes cover the main formats, and our Printed Postal Boxes suit sellers who want branding across a wider postal range.

Test the packed box the way the postal network will treat it. Close it, shake it, drop it from bench height onto a hard floor and check the corners. If the product moves, knocks or the lid lifts, adjust the size or the insert before ordering a full run, because a failed test at your bench is far cheaper than returns.

Postage bands and packed weight

Royal Mail prices by size band as well as weight, so a box that tips a parcel into a larger band adds cost to every order. Many mailer orders travel as small parcels, allowing up to 450mm by 350mm by 160mm and 2kg. Check the current detail in the Royal Mail small parcel guidance and weigh your finished pack, including the box and inserts, before you set your postage charges.

Ordering mailer boxes for your business

Tell us the internal size you need, the product it must hold, how it will be posted and what print you want inside and outside. If you sell several product sizes, we can help you settle on a small family of box sizes that covers your range without leaving any product swimming in spare space.

Pricing depends on size, material and quantity, and every order is quoted individually. Request your quote through our contact page for a quote and the team will confirm the specification, artwork checks and free UK delivery for your order.

FAQs

What is a mailer box?

A mailer box is a corrugated carton with a hinged lid and a self locking or adhesive closure, designed to protect products through the post and present them neatly on opening. It is the standard format for ecommerce orders, gifts and subscription boxes.

What can I pack in a mailer box?

Clothing, cosmetics, candles, books, food gifts, electronics accessories and many other retail products suit mailer boxes. The key is matching the internal size to the product and adding an insert or wrap where the product is fragile or must not move.

Should I print inside my mailer boxes?

Inside print suits brands where the opening moment matters, such as gifts and subscriptions, because the message is revealed as the lid lifts. If budgets are tight, start with strong outside branding and add inside print once order volumes support it.

How do I choose the right mailer box size?

Measure the product as it will be packed, including any insert or wrapping, then choose the smallest internal size that holds it without force. Weigh the finished pack and check its external size against your postage band before ordering.

What affects the price of mailer boxes?

Size, board material, print coverage, inserts and quantity all affect pricing, which is why every order is quoted individually. Low minimum order quantities let you start with a sensible run, and UK delivery is free.