Custom End Opening Mailer Boxes in Kraft or Printed Board

What is an end opening mailer box?

It is a folding corrugated mailer whose lid lifts from one short end. The lid is hinged along the back, and when raised it reveals the whole of the inside in one go.

The ends are rolled panels. They fold over on themselves and lock into the base, which keeps the corners square without glue. In our photos you can see kraft, orange, teal and printed versions, some with tissue and one with a central card divider.

You may also hear the name used for a slim carton that slides open at a short end. If that is what you need, our side loading mailers for flat items may be closer to the mark.

Why open from the end rather than the side?

Opening along the short end gives a long, deep lid. When it is lifted, the inside of the lid faces the customer like a page, which is why so many brands print a message there.

The hinge at the back also keeps the box closed when it is stood on a shelf. That helps shops that store packed orders before dispatch, or customers who keep the box afterwards. The rolled ends add stiffness along the two short sides, which is where boxes are usually gripped and carried.

How do I work out the right size?

Lay out every item as it will be packed, including any divider, card or tissue. Measure the length, width and height of that arrangement and give us those as inside sizes.

End opening mailers suit a low, wide shape. A box much taller than it is wide becomes awkward to open from the end, and the lid can flop. If your items are tall, a tuck top style may suit better. Our page on common UK cardboard box sizes gives typical shapes for postal parcels.

A good test is a mock-up. Tape a rough box from an old carton at your chosen size and pack it fully. If the lid closes flat and nothing moves when shaken gently, the size is right. If the lid bulges, add height; if items slide, reduce the length or width.

Board and wall choices

Most end opening mailers are single wall, as the rolled ends already add strength where it counts. Pick the flute by weight and print.

White board shows colour brighter, while kraft gives print a softer, warmer tone. If you are printing one colour, kraft often looks the most natural. For full colour photos or bright brand shades, white E flute is the safer pick. Double wall is rarely needed for this style unless the kit is unusually heavy.

Can I add dividers or an insert?

Yes. A single card divider down the middle, like the teal box in our photos, keeps two products apart and stops them knocking. A cut insert can hold bottles, tins or tools in fixed spots.

Tell us the size of each item and how you want them arranged. We will quote the box and insert together so the fit is planned from the start. For more options, see our range of corrugated box dividers and partitions.

Print ideas for an end opening lid

Because the lid opens like a cover, the inside lid panel is prime space. Icons, a short thank-you, or how-to-use steps all work well there.

We print plain, one colour, two colour or full colour CMYK, and can print inside and out. Matte or gloss lamination, spot UV, foil stamping and embossing are available, or you can leave the kraft uncoated. A logo on the front end panel helps on a shelf, as it faces outwards when boxes are stacked.

Think about the order in which things are seen. The outside end panel is seen on a shelf, the top on a doorstep, and the inside lid once opened. Using a different message for each keeps the box interesting without filling every panel.

Mistakes people make with end opening boxes

The common errors are about shape and layout. A box that is too tall makes the lid floppy. Artwork placed across the rolled end folds can look broken when the box is built.

Another is forgetting the divider in the size. A 2 mm card wall still takes space, and three dividers take more. Check the proof carefully, as it marks every fold and cut.

Finally, some buyers choose a very thin board to save weight, then find the lid bends when the box is carried. If you are unsure, ask us for advice before you approve the quote.