kraft mailer boxes

kraft mailer boxes are sturdy corrugated boxes with a natural brown kraft finish that are made to protect products in the post while giving a clean branded unboxing. They are a popular choice for online shops, subscription services and small makers because the outside can carry a logo or simple artwork and the inside can stay plain or carry a short message. A well sized kraft mailer keeps the product still, resists crushing in transit and arrives looking intentional rather than improvised.

What kraft mailer boxes are made to do

A mailer box is different from a plain shipping carton because it is designed to be seen. The lid usually folds in a tidy way, the sides lock or tuck neatly, and the board is smooth enough for clear printing. That combination matters when the box is the first physical contact a customer has with a brand after ordering online. A kraft mailer does that job without a glossy plastic look, and the natural brown surface suits brands that want a calm, honest and practical feel. For a closely related posting option, see kraft mailing boxes.

Inside, the same box must do practical work. It must hold the product through sorting, stacking and handling, and it must close securely so it does not spring open. Corrugated kraft board gives a balance of lightness and strength, so the parcel stays manageable to lift and post while still protecting clothing, skincare, candles, stationery, accessories and similar light to medium weight goods. For heavier or fragile goods, a stronger board grade or added protection inside the box is the sensible next step.

How a kraft mailer box is built

Most kraft mailer boxes use corrugated board, which is a flat liner sheet bonded to a wavy fluted layer. The fluting creates air space that cushions the contents and helps the box resist crushing. E flute board is thinner and gives a smoother print surface, which suits retail style mailers. B flute board is thicker and gives more cushioning, which suits goods that need extra protection or parcels that will travel further. The choice between them depends on product weight, fragility and how much print detail the design needs.

Closure style also changes how the box feels in use. A tuck top lid folds into the front of the box and gives a neat retail finish. A self locking lid uses tabs that hold the lid in place without tape on the top, which can speed up packing. Dust flaps at the sides help keep the lid aligned and stop small items slipping out at the corners. Tape is still useful for security on many postal journeys, especially for heavier parcels, and a single strip across the main seam is often enough when the box is correctly sized.

Board grades and print surfaces

Board grade should follow product weight rather than appearance alone. Light apparel and flat goods do well in a lighter mailer, while jars, bottles and multi item sets need a stronger grade and a snug fit. Print on kraft board looks different from print on white board because the brown background warms every colour. Dark inks, deep greens, navy and black tend to stay bold, while pale colours may need a white ink base to stay legible. A simple one colour logo often looks sharper on kraft than a busy full colour design, and it also keeps the artwork easy to read at a glance.

Choosing kraft mailer boxes for an online shop

Start with the product as it will actually be packed, not as it looks on a shelf. Measure length, width and height at the widest points, including any lid, handle or cap, then add a small allowance for tissue, a sleeve or a protective wrap. A box that is only just large enough can crush tissue and press against the product, while a box that is far too large lets the product move and needs extra void fill. The best fit is close, calm and easy to close, with no bulging sides and no empty space that allows sliding.

Think about the whole journey, not only the moment of packing. A mailer that will be posted on its own needs a stronger closure and a surface that accepts a label cleanly. A mailer that will go inside an outer carton for wholesale can be lighter, because the outer carton carries the main postal load. If customers will reuse the box for storage or returns, a tidy lid and a clear returns label area are useful details that cost little at the design stage.

Sizes that suit common products

Small mailers suit jewellery, accessories, samples, phone cases and single skincare items. Medium mailers suit folded clothing, candle sets, books, stationery sets and gift collections. Larger mailers suit knitwear, shoes, multi item subscription boxes and bundled gift sets. There is no single standard size that fits every product, so custom sizing is often the most practical route when a product has an unusual shape or when a brand wants a consistent box across a range. Browse the wider choice in kraft packaging boxes if you also need plain protective cartons alongside mailers.

When comparing sizes, check whether dimensions are internal or external. Internal dimensions show the usable space inside the box, while external dimensions include board thickness and folds. A difference of a few millimetres can matter for a tight fitting product, so ask for both sets of figures before approving a design. A sample or a plain prototype is worth requesting for a new product, because it reveals fit, closure and print legibility in a way a flat drawing cannot.

Inserts and protection inside the box

Inserts turn a good mailer into a reliable one. A simple cardboard divider can stop jars knocking together, a fitted insert can hold a bottle upright, and a tissue wrap can protect a printed surface from scuffing. Paper based inserts keep the whole parcel easy to recycle in many local collections, provided finishes and tapes are kept simple. Avoid loose fill that shifts in transit, and avoid wrapping that adds bulk without adding protection. The aim is a parcel that opens neatly and shows the product in place, not a parcel that needs unpacking from a tangle of material.

Printing and branding on kraft mailer boxes

Print should help the customer, not only decorate the box. A clear logo on the lid, a short brand name on the side and a simple message inside can make the parcel feel considered without turning it into an advertisement. Inside printing is especially effective for a short thank you note, care instructions or a returns reminder, because the customer sees it at the moment of opening. Keep text large enough to read on brown board, and test dark and light artwork on a real kraft sample before approving a full run.

Finishes need the same restraint. Foil and embossing can lift a premium gift mailer, but they can also change how easily the box is recycled, depending on the finish and local rules. Uncoated kraft with simple print is usually the easiest route for recycling, and it also suits brands that want a natural look. For producer duties that may apply to packaging, see GOV.UK guidance on extended producer responsibility for packaging. If a special finish is important, ask how it affects the board and whether a simpler finish would give a similar effect with fewer complications.

Artwork and ordering with a quote

A smooth quote starts with clear information. Share product dimensions, the number of items per box, the board strength you need, the print coverage you want and the quantity you expect to order. Share artwork in a print ready format if you have it, or share a logo and a simple brief if you need help preparing artwork. After final artwork approval, corrugated boxes on this site are typically produced in 12 to 15 working days, which is a production lead time and not a guaranteed delivery date. Confirm the full timeline for your order when you request a quote, including any time needed for artwork checks.

All boxes from this site are quote only, so no price is stated on this page. A quote lets the specification be matched to the product, the quantity and the finish, rather than forcing a generic box onto a specific product. That approach is particularly useful for kraft mailers, where board grade, size and print coverage can change the result more than the outer appearance suggests.

Checking a sample before a full run

Check a sample for fit, closure, label adhesion and print contrast. Place the label where it will sit in real use and check that it lies flat and scans clearly. Close and reopen the lid several times to see whether tabs weaken. Stack a few filled boxes to see whether the board holds its shape. These small checks catch most problems early, when they are easy to correct, and they give confidence before a larger quantity is produced.

Frequently asked questions about kraft mailer boxes

What are kraft mailer boxes used for

kraft mailer boxes are used to post and present light to medium weight products such as clothing, skincare, candles, stationery, accessories and subscription sets. They protect the product in transit and give a branded unboxing without an outer shipping carton in many cases.

Are kraft mailer boxes recyclable

Uncoated corrugated kraft board is widely recyclable through paper recycling where local collection accepts it. Printed finishes, heavy coatings, plastic tape and mixed material inserts can affect recycling, so keep finishes simple and check local guidance if recycling is a key part of your brief.

What size kraft mailer box do I need

Measure your product at its widest points, add a small allowance for protective wrap or tissue, and choose a box with internal dimensions that hold the product snugly without bulging. If the product is fragile or has an unusual shape, a fitted insert or a custom size will give a better result than a close standard size.

Can kraft mailer boxes be printed inside and outside

Yes, kraft mailer boxes can be printed outside, inside or both, depending on the design and the board chosen. Outside print carries the main brand message, while inside print suits a short thank you note, care instructions or a returns reminder that the customer sees on opening.

How long do corrugated kraft mailer boxes take after artwork approval

After final artwork approval, corrugated boxes on this site are typically produced in 12 to 15 working days. This is a production lead time, not a guaranteed delivery date, so confirm the full timeline for your order when you request a quote.