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Your mailer box needs to protect the order, fit your fulfilment process and represent your brand when it reaches the customer. A poorly matched box can waste packing space, while insufficient internal protection can leave products vulnerable during handling. Custom Mailer Boxes let you specify the dimensions, corrugated board, closure and printed design around the products you sell.
Product Boxes UK offers personalised mailer packaging for online retailers, growing brands and businesses managing regular dispatches. Choose practical corrugated boxes for multi-item orders, compact mailers for suitable flat products or branded designs for a more considered delivery experience.
Our custom packaging solutions UK range supports businesses that need packaging designed around their products, identity and operational requirements. From material selection to print layout, the specification should suit the shipment rather than force every order into the same box.
| Mailer type | Suitable applications | Features to consider |
|---|---|---|
| Corrugated mailer boxes | Clothing, accessories, electronics and multi-item orders | Flute grade, protective inserts and printed panels |
| Large Letter mailers | Flat products, stationery and suitable lightweight samples | Finished thickness, dimensions and packed weight |
| Self-seal cardboard mailers | E-commerce orders requiring quick closure | Adhesive strips and tear-open features |
| Kraft-finish mailers | Everyday orders and natural-style branding | Kraft liners, logo printing and material specification |
| Premium presentation mailers | Gift orders, product launches and curated collections | Interior printing, decorative finishes and inserts |
The structure determines how a mailer opens, holds its shape and protects the contents. Select the box around the product’s weight, dimensions and intended delivery method.
Single-wall corrugated mailers combine paper liners with a fluted middle layer. E-flute has a relatively fine profile and can suit compact packaging where print presentation matters. B-flute is thicker and may be appropriate when the box needs a different balance of cushioning and stiffness.
Custom corrugated mailer boxes for wholesale orders in the UK can be developed around your dimensions, board requirements and branding. For fragile or heavier products, choose an appropriate construction and assess whether additional inserts or cushioning are needed. Corrugated board alone does not guarantee protection against every impact.
Tuck-in flaps and self-locking structures provide practical closure options for different mailer designs. Self-seal cardboard mailers can include adhesive strips to reduce the need for separate tape during packing. A tear-open strip can make the box easier for customers to open, where the selected construction supports it.
Closure choice should reflect both fulfilment speed and the security required in transit. For repeat dispatches, test the assembled box with the actual product and any protective components before approving the final dimensions.
Internal components can help prevent items moving around inside the box. Options include:
Insert selection depends on the product’s shape, surface, weight and cushioning requirements. The insert must fit inside the box without putting pressure on the contents or preventing the lid from closing properly.
The board grade influences thickness, strength, print surface and overall package weight. Choose the construction according to the packed product and expected handling conditions.
| Material stock | Approximate flute profile | Primary applications | Environmental profile |
|---|---|---|---|
| E-flute, single-wall corrugated | Around 1.5–2 mm | Compact mailers and lightweight retail products | Fibre-based; coatings and other components affect recyclability |
| B-flute, single-wall corrugated | Around 2.5–3.5 mm | General e-commerce orders requiring a thicker corrugated profile | Fibre-based; confirm the finished pack’s disposal options |
| EB-flute, double-wall corrugated | Around 4–5 mm overall | Selected shipments requiring additional board thickness | More material is used than in a comparable single-wall construction |
| BC-flute, double-wall corrugated | Around 6–7 mm overall | Heavier products and more demanding shipping applications | Final environmental profile depends on board composition and added components |
| Kraft-faced corrugated | Varies by flute and grade | Natural-looking mailers with branded printing | Kraft appearance does not automatically establish recyclability or compostability |
These dimensions are indicative and vary with the board manufacturer and grade. Confirm the specification before production, particularly for heavier products or boxes that must fit within a postal format.
For brands looking for Kraft mailers with their logo, a natural liner can provide a simple background for printed branding. Environmental claims should reflect the finished packaging: coatings, adhesives, inks and inserts may affect the available recycling route.
Kraft and white SBS paperboard are also used for folding cartons and presentation packaging, while rigid chipboard suits more substantial gift boxes. These are separate constructions from a typical corrugated mailer and should be selected according to the intended use.
A recognisable printed box helps customers identify your business and gives your orders a consistent appearance. Personalised mailer packaging can feature your logo, brand colours, product information, QR codes, campaign graphics or messages printed inside the lid.
Available options depend on the material and print process, but may include:
Soy-based inks may be an option for suitable printing processes, but their availability should be confirmed before including them in a specification. The same applies to any claim about food-contact suitability or environmental performance.
Inside printing can carry a welcome message, product instructions or campaign artwork. Keep the exterior clear enough for shipping labels and operational information, and ensure decorative finishes do not interfere with the box’s closure or intended use.
If postage cost is important to your business, design the mailer around the finished packed item. Board thickness, folded flaps, inserts and contents all affect the final dimensions.
Royal Mail publishes the following limits for common UK formats:
| Format | Maximum dimensions | Weight limit |
|---|---|---|
| Large Letter | 35.3 × 25 × 2.5 cm | 750 g for standard Large Letter services; some online Tracked services allow up to 1 kg |
| Small Parcel | 45 × 35 × 16 cm | 2 kg for Royal Mail Tracked 24 |
Check Royal Mail’s current Tracked 24 guidance and the specific service you intend to use before finalising packaging.
Small, letterbox-compatible mailers can suit flat products and lightweight orders when the complete shipment meets the relevant limits. Larger postal boxes provide more space for bundled products, protective inserts and accessories.
Do not assess postal eligibility using the empty box alone. Test a fully packed sample and verify its outside dimensions and weight before committing to a production run.
Businesses sending curated monthly deliveries can explore custom subscription boxes for packaging that suits recurring product collections. For shipments that require additional cushioning or more specific internal protection, our branded protective packaging range offers further options to consider.
Keeping box dimensions and core specifications consistent across repeat orders can simplify purchasing and packing, provided each product receives the protection it needs.
The right order quantity depends on the design, material, dimensions, printing process and finishing requirements. Low-MOQ options may be possible for selected specifications, while larger orders can be priced at volume-based rates.
Before approving artwork, ask for the applicable minimum quantity, unit price, any tooling charges and delivery cost to be shown in your quotation. This gives your purchasing team a clear basis for comparing options without assuming that every custom design carries the same terms.
For an accurate quote, provide your product dimensions, approximate packed weight, required quantity, artwork and preferred delivery format. Include requests for self-seal closures, printed interiors and inserts so the proposed construction accounts for the complete pack.
Production and delivery schedules depend on the confirmed specification and order volume. Agree the timetable before planning a launch or high-volume dispatch.
Email sales@productboxes.uk with your product dimensions, target quantity and artwork. Include a product photo or reference sample if available, along with any postal size requirements.
We can then assess suitable mailer styles, corrugated grades, closure options and print specifications for your order. The resulting quotation should set out the applicable minimum quantity, pricing and delivery terms so you can make an informed purchasing decision.
What is the difference between E-flute and B-flute corrugated custom mailer boxes?
E-flute corrugated board (approx. 1.5mm) features a tight flute profile ideal for high-resolution graphics, sleek retail presentation, and lightweight e-commerce items. B-flute board (approx. 3mm) provides thicker cushioning, higher stacking strength, and superior puncture resistance for heavier shipments.
Can I print my brand artwork on both the inside and outside of custom mailers?
Yes. We specialize in double-sided full-color custom printing (4/4 CMYK and Pantone matching). You can showcase your primary logo and branding on the exterior while transforming the inner lid and walls into an engaging unboxing experience.
Are custom mailer boxes sturdy enough to ship without secondary outer packaging?
Yes. Constructed with self-locking roll-end tuck-top (RETT) or ear-lock (RELF) structures and reinforced double sidewalls, our corrugated mailer boxes are specifically engineered to withstand transit impact across UK Royal Mail, DPD, FedEx, UPS, and DHL postal networks.
Should I choose white corrugated board or natural Kraft corrugated board?
Bleached white corrugated board offers a bright canvas that ensures vivid CMYK colors, pastel shades, and complex designs print with maximum clarity. Unbleached Kraft board provides an eco-friendly, organic aesthetic ideal for dark typography, minimalist graphics, and sustainable branding.
Are your custom mailer boxes eco-friendly and fully recyclable?
Yes. Our custom mailers are manufactured using up to 80% post-consumer recycled fibers, FSC®-certified cardboard, and non-toxic water-based or soy-based inks. They are 100% curbside recyclable in standard UK and US household paper waste streams.
What surface laminations and protective finishes are available?
You can customize your mailer boxes with soft-touch matte lamination, scratch-resistant matte film, high-gloss UV coating, spot UV highlights, and hot metallic foil stamping (gold, silver, rose gold) to protect the exterior print against scuffing during courier handling.
Can precision die-cut inserts be integrated inside custom mailers?
Yes. We engineer bespoke die-cut corrugated dividers, paperboard trays, or shock-absorbing EVA foam inserts tailored specifically to the dimensions of your items to eliminate internal movement and prevent product damage.
Can peel-and-seal adhesive strips and tear-open strips be added to mailer boxes?
Yes. We can integrate dual peel-and-seal adhesive strips for fast, tape-free packing and easy customer returns, alongside built-in red tear strips for a smooth, tool-free unboxing experience.
How are internal dimensions measured for custom mailer box dielines?
Custom box dimensions are always measured by internal clearance: Length (L) x Width (W) x Depth (D). Providing exact internal dimensions ensures your products fit snugly inside the box without requiring excessive void fill.
Do you supply custom vector dielines and 3D digital renders prior to production?
Yes. Once your exact box dimensions are confirmed, our packaging engineers generate custom vector dielines (.AI/.PDF) alongside photorealistic 3D digital mockups so you can review artwork alignment before manufacturing begins.
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