corrugated mailer boxes

corrugated mailer boxes are folding boxes made from fluted corrugated board that protect products through the post while presenting them neatly on arrival. Custom Postal Boxes, a project of Vertex Packaging based in Wolverhampton, makes corrugated mailer boxes in house to custom sizes, with print inside and out, low minimum order quantities and free UK delivery.

How corrugated mailer boxes protect products in transit

Corrugated board has a wavy fluted layer between two flat liners, and that structure absorbs knocks and resists crushing far better than a plain folding carton of similar weight. A mailer box folds from a flat blank into a rigid tray with a hinged lid, often closing with a tuck flap or a self seal strip, so it packs quickly and opens cleanly without a knife. Rival pages emphasise flute choice, internal fit and print inside the lid, which matches what buyers ask about most: strength, speed of packing and how the box looks when it opens.

Choosing a flute profile for your products

Fine flutes give a smoother print surface and a slimmer box, which suits cosmetics, jewellery and other light goods where presentation leads. Broader flutes add cushioning and stacking strength for heavier or more fragile contents, such as candles in glass or boxed electronics. Tell your packaging maker what the product weighs and how it will travel, because the right flute is the one matched to the load, not simply the thickest board on offer.

A close fit reduces damage and fill

Movement inside a box is a common cause of scuffs, dents and broken corners. A mailer sized closely around the product, with an insert where needed, holds everything steady and cuts the amount of loose fill you buy and store. It also keeps the finished parcel lighter and smaller, which helps postage costs on every order.

Print and finish options for corrugated mailer boxes

Mailer boxes are a natural branding surface because the customer handles every panel. Print your logo and colours outside for recognition on the doorstep, then use the inside lid for a thank you message, care guidance or a prompt to share the purchase. Explore our corrugated mailer boxes product range alongside cardboard mailer boxes and custom mailer boxes for UK brands to compare formats before you settle on a structure.

Inserts, seals and packing speed

Card inserts can separate bottles, jars or components so they arrive arranged as intended rather than settled in a corner. Self seal strips speed up a busy packing bench and give a tidy close, while a tear strip helps the customer open the box without scissors. For heavier contents, tape may still be the safer close, so match the closure to the weight and value of what is inside rather than to habit alone. Parcel size still matters, and the Royal Mail size guidance for tracked parcels shows the large letter and parcel limits your packed mailer must sit within.

Ordering corrugated mailer boxes for your range

Good mailer design starts with the largest and heaviest item the box must hold, then works back to board, insert and print. Pricing depends on size, material and quantity, and ordering is quote based with free design support, so artwork, board and sizing are agreed before production. Boxes are manufactured in house in Wolverhampton, which keeps communication direct when a size needs adjusting after a sample.

Look through the custom mailer boxes category for related styles, then request a quote with your product dimensions and quantity. A short note about how orders travel, by Royal Mail, courier or both, helps us recommend the right board from the start.

FAQs about corrugated mailer boxes

What are corrugated mailer boxes used for?

They are used to post and present products such as cosmetics, clothing, candles, gifts and subscription items. The fluted board protects contents in transit while the folding lid gives a neat and branded opening experience.

Can corrugated mailer boxes be printed inside and outside?

Yes. Both faces can carry print, so branding can appear outside for recognition and inside the lid for messages, guidance or a more considered unboxing moment. Free design support helps prepare both sides correctly.

How strong are corrugated mailer boxes?

Strength depends on flute profile, board grade and fit. Fine flutes suit light goods, while broader flutes add cushioning for heavier or fragile items. Sharing your product weight helps us specify board that matches the load.

Do mailer boxes need tape to close them?

Many mailer formats close with a tuck flap or a self seal strip and need no tape for light contents. Heavier or higher value orders may still benefit from tape, and we will advise based on what you send.

How do I order custom size mailer boxes?

Send your product dimensions, weight and quantity through our contact page and request a quote. Pricing depends on size, material and quantity, with low minimum order quantities and free UK delivery.