Custom Mailer Boxes That Turn a Delivery Into a Brand Moment

A product can be perfect and still lose the sale on the second order, because the box it arrived in did nothing to make the customer remember who sent it. Plain brown packaging gets the job done once; it rarely earns a repeat customer or a tagged unboxing post. That's the gap custom mailer boxes are built to close: a postal-ready box that protects what's inside and does real branding work the moment it lands on a doorstep.

We print and construct these mailer boxes in-house, in five sizes across two premium cardboard substrates, with inside and outside printing available and a minimum order of just one, so a first small batch for a new product launch gets the same attention as a repeat run for an established line.

Specification at a Glance

Choose your format and size above, pick a substrate to match your product's weight and branding needs, and add to cart, the sections below cover exactly what each choice affects if you want the detail before you commit.

Why Brands Choose Custom Mailer Boxes

Built for E-commerce Brands

Branded packaging makes customers remember who sent the product, turning a single purchase into the start of a relationship rather than a one-off transaction, the difference between a delivery and a repeat order.

Print Inside and Outside

Custom interior printing, a thank-you message, a pattern, a printed lid, turns the packaging itself into part of the product, not just the container around it.

Full Colour CMYK Printing

Every order is produced at 300 dpi in CMYK, giving sharp, consistent brand colour reproduction that reads as a professional, established business next to a generic brown carton.

Available in White and Kraft Finishes

E-flute and B-flute substrate options in White Double-coated or Havana kraft let you match structural cushioning and finish to the product, rather than over- or under-packaging by default.

From Just 1 Box

Production starts from a single unit, so a new design can be tested and validated before scaling into a full production run, a materially lower-risk way to launch branded packaging than committing to a large minimum order upfront.

3-Day Express Production

Need boxes fast for a launch or a deadline? Express turnaround gets your order produced in 3 working days, alongside the 4-day Standard option for everything else.

Custom Mailer Boxes With Your Logo

If you're specifically after custom mailer boxes with logo printing, this is where full-colour CMYK reproduction earns its keep. Every order is produced at 300 dpi in CMYK, giving sharp, consistent logo and brand colour reproduction across the White Double-coated substrate, and bold single- or two-colour logo work prints cleanly against the natural Havana kraft base too. Branded mailer boxes and personalised mailer boxes are the most common reason brands come to us in the first place, whether that's a logo alone, full packaging artwork, or a design that changes seasonally.

Printing is available outside only, inside only, or on both sides, so a logo-led exterior can be paired with an interior message or pattern without any extra production step. Artwork can be uploaded now (PDF only) or sent through afterwards via a link generated at checkout.

Available Mailer Box Styles

Gift Mailer Boxes, a presentation-forward format suited to gift sets, cosmetics and jewellery, where the box itself is part of the product experience. Popular with gift businesses and premium retail packaging.

Shipper Boxes, the largest format range, built for bulkier retail orders, multi-item bundles and heavier e-commerce shipments. The go-to choice for ecommerce packaging where volume and weight matter most.

One-Piece Mailer Boxes, a single continuous die-cut construction in A3 to A5 footprints, efficient to assemble and well suited to flat or slim products like apparel, prints and stationery.

Tuck-Top Mailer Boxes, the classic interlocking, tape-free closure and the most popular style overall, suited to:

• Ecommerce packaging and direct-to-consumer fulfilment
• Apparel and clothing packaging
• Subscription boxes and repeat monthly shipments
• General retail fulfilment across most product categories

Wine Carrier Mailer Boxes, one, two or three-bottle formats designed specifically for secure bottle transit, available with the same custom print options as the rest of the range. Suited to:

• Wine retailers and independent merchants
• Gifting businesses building bottle-led hampers or presentation sets
• Subscription wine clubs shipping monthly or seasonal cases

Who Uses These Mailer Boxes

Custom mailer boxes are our most requested shipping packaging boxes, and the brands ordering them tend to fall into a handful of recognisable categories:

• E-commerce brands shipping direct to consumer who need ecommerce mailer boxes that protect the product and reinforce the brand on arrival
• Subscription box businesses where subscription box packaging is part of the monthly product experience itself, not just the delivery mechanism
• Cosmetics and skincare brands using the bright white E-flute substrate to carry full-colour branding and product photography
• Clothing and apparel brands shipping folded garments in the medium and large Tuck-Top or Shipper formats
• Jewellery and accessories brands using the smaller Gift Mailer and Tuck-Top formats for a presentation-led unboxing
• Candle and homeware brands needing B-flute's added cushioning alongside branded exterior print
• Gift businesses using the Gift Mailer and Wine Carrier formats for pre-packaged or made-to-order gifting
• Brands launching a new product who want professional custom packaging boxes from their very first order, not just once volume justifies it

Choosing the Right Substrate

One point worth knowing before you finalise artwork: white printing isn't available on the Havana substrate, and printed colours can vary slightly against its natural tone. Not sure which substrate suits your product? Our comparison of kraft, cardboard, corrugated and rigid mailer box materials breaks down how each behaves under weight and in transit.

These boxes are not food-safe and shouldn't be used for cupcakes or products needing food-contact packaging, for that, our food packaging boxes range is built specifically for direct food contact.

Why Businesses Choose I YOU PRINT

We're a Croydon-based print and display studio producing custom printed mailer boxes UK-wide for e-commerce and retail brands, printed and constructed in-house rather than outsourced to a third-party converter. That means:

• UK production, based in Croydon and shipping nationwide across London and the rest of the country
• Low minimum order quantities, starting from a single unit rather than a large bulk commitment
• Express production available, with a 3-working-day turnaround alongside the 4-day Standard option
• Inside and outside printing, so branding isn't limited to the exterior alone
• Artwork support, with files accepted at checkout or via a link sent afterwards
• In-house colour-matching, since production isn't relayed through a third-party converter

Need Help Choosing?

If you want more detail before ordering, these guides cover the decisions that matter most:

• Choosing your size, how to choose the right mailer box size for your specific product
• Choosing your material, kraft vs cardboard vs corrugated vs rigid, compared side by side
• The full packaging decision, ourn complete guide to custom mailer boxes and branded packaging

If mailer boxes aren't quite the right fit for what you're shipping, our crash lock promotional boxes offer a fast-assembly alternative, and the wider shipping packaging boxes range covers other postal and courier formats.

Custom Mailer Box Questions We're Asked Most Often

What size custom mailer box do I need?

It depends on your product's packed dimensions rather than the product alone, measure it with any inserts or wrap already in place and match that to the nearest available size. Our size guide covers the full measuring process if you're ordering for the first time.

Can I order custom mailer boxes with my logo in low quantities?

Yes, orders start from a single unit, so you can test a design and print quality before committing to a larger production run, which is a lower-risk way to validate new branded packaging than a high minimum order.

What's the difference between E-flute and B-flute mailer boxes?

E-flute is thinner and gives a more refined finished box with crisp print detail, suiting most retail and cosmetics packaging. B-flute is thicker, adding structural cushioning for heavier or bulkier products at a slightly larger finished size.

Are these mailer boxes suitable for food packaging?

No, these boxes are not food-safe and shouldn't be used for cupcakes or products needing food-contact packaging. Our food packaging boxes range uses board and coatings specified for that purpose instead.

How long does it take to print custom mailer boxes?

Standard turnaround is 4 working days, with a 3-day Express option available, both measured from artwork approval and not including delivery time.

Can I print on the inside of the mailer box as well as the outside?

Yes, printing is available outside only, inside only, or on both sides, and interior printing is a popular way to add a thank-you message or pattern that's revealed only once the box is opened.

Will white ink print on brown kraft mailer boxes?

No, white printing isn't available on the Havana (brown kraft) substrate, and printed colours can vary slightly against its natural tone. The White Double-coated substrate is the better choice for exact colour reproduction.

Order Your Custom Mailer Boxes Today

Every specification on this page, format, substrate, print sides, quantity and turnaround, is ready to configure above, with production starting from as little as one unit and a full Express option if you're working to a launch date. Select your format and add to cart to get your custom mailer boxes into production.