Mailer boxes have to survive handling before anyone sees the print inside. Getting the board, size and closure right keeps the product from moving about and gives the customer a tidy box to open at the other end.
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A mailer that looks about the right size when empty can feel very different once the product goes inside. Leave too much room and the contents move from one end to the other during delivery. Make it too tight and there’s nowhere for an insert, tissue or other protective material.
We normally look at everything going into the parcel together: the product, its retail carton, any insert and the presentation material. Those measurements give a more useful starting point than picking a standard mailer box size from a list.
For products needing more transit strength, the board can also be considered alongside other corrugated packaging options rather than increasing the box size unnecessarily.
Not every mailer needs the thickest corrugated board available. A lightweight skincare order puts relatively little pressure on the base. Several glass bottles, candles or heavier products are a different matter, especially when parcels are stacked during distribution.
The board grade should reflect the packed weight and journey. This is also why a sample is useful for heavier products. Loading the actual contents into the box shows whether the base, side walls and hinged lid behave as expected before a larger order is produced.
Some products sit securely in a close-fitting mailer without anything else. Others don’t. A bottle, jar or multi-product set may move even when the outer box dimensions are correct. Custom mailer boxes with inserts give those products a fixed position and can make the contents look much more deliberate when the lid is opened.
An insert can be developed with fitted internal packaging for one product or several items arranged together. The fit shouldn’t be excessively tight. Customers still need to remove the product without tearing the insert apart.
The outside of an eCommerce parcel goes through courier depots, vans and doorsteps. It may pick up marks along the way. That makes inside printing useful for brands that want the cleaner part of the design to appear when the customer opens the lid.
Some branded mailer boxes use a simple logo outside and put the stronger artwork under the lid. Others print the entire box. Kraft mailer boxes can be left relatively simple, while white board provides a different base for brighter printed colours. Black, blue, red and other coloured designs can also be produced through print rather than relying on a stock coloured box.
A mailer doesn’t always replace the product’s main packaging. An online cosmetics order, for example, might contain several individually printed retail cartons inside one shipping box. The mailer deals with delivery while the smaller cartons carry the product information and shelf branding.
This approach also works for gift and subscription orders. Several products can be arranged together rather than posting each one separately. Businesses sending recurring collections may use the same structure for their subscription packaging and change the printed artwork or insert as the contents change.
Once a business starts sending hundreds of parcels, small differences in box size become noticeable. An oversized mailer uses more board, can require extra void fill and occupies more space in storage. A box that’s difficult to fold also adds time to every packing order.
Before ordering mailer boxes wholesale, it makes sense to settle the internal dimensions, board and insert together. Once those details are approved, the same specification can be used for bulk and repeat production.
Main Options
| Dimension (L + W + H) | All Custom Sizes & Shapes |
|---|---|
| Quantities | No Minimum Order Required |
| Paper Stock | 210gsm, 250gsm, 280gsm, 300gsm, 350gsm, 420gsm, 460gsm, 500gsm, Bleach Card (SBS), Eco-Friendly Kraft, E-flute Corrugated, Bux Board, etc. |
| Printing | No Printing, CMYK, CMYK + 1 PMS color, CMYK + 2 PMS colors |
| Finishing | Gloss Lamination, Matte Lamination, Gloss AQ, Gloss UV, Matte UV, Spot UV, Embossing, Foiling |
| Included Options | Die Cutting, Gluing, Scoring, Perforation |
| Additional Options | Eco-Friendly, Recycled Boxes, Biodegradable |
| Proof | Flat View, 3D Mock-up, Physical Sampling (On request) |
| Turnaround | 7 – 10 Business Days, RUSH |
| Shipping | FLAT |
How do I choose the right mailer box size?
Measure everything that will go inside, including the product, retail packaging and any insert. Allow enough clearance for packing without leaving excessive empty space.
Are mailer boxes suitable for shipping without another box?
Many corrugated mailer structures are used as outer eCommerce packaging. Whether one is appropriate depends on the product weight, fragility and delivery conditions.
When should I add an insert to a mailer box?
An insert is useful when products can move, collide or need to remain in a particular position. Multi-product sets and fragile items are common examples.
Can mailer boxes be printed on the inside?
Yes. Inside printing is often used beneath the lid or around the internal panels, while the outside can remain plain or carry simpler branding.
What is the difference between kraft and white mailer boxes?
Kraft provides a natural brown surface, while white board gives printed colours a different base. The appropriate choice depends on the artwork, finish and packaging specification.
What information is needed for a custom mailer box quote?
Product dimensions, packed weight, required quantity, preferred box size or structure, printing requirements and details of any inserts are useful starting points.
Can the same mailer box be used for several products?
It can when the products have similar packed dimensions. If sizes vary considerably, separate boxes or different inserts may reduce movement and unnecessary empty space.
Compare stock types, print routes, ink options, finishing touches, and premium add-ons without jumping between pages.
A dependable fluted board built for shipping pressure, stacking strength, and day-to-day courier handling. A practical choice when protection matters as much as presentation.
A natural-looking stock with a warm, honest finish. It suits brands that want a grounded, minimal, and more responsible packaging appearance.
A bright white surface that delivers crisp print, cleaner colour reproduction, and a polished retail look for detailed branding work.
A rich dark stock made for brands that want contrast, restraint, and a more elevated shelf presence without over-designing the pack.
A smart option for smaller quantities, quicker launches, and product lines where artwork changes often. Great for agility without sacrificing presentation.
Ideal for longer production runs where colour control, fine detail, and repeat consistency need to stay locked in from batch to batch.
Used when packaging needs extra touch appeal. It adds elevated detail that catches light and gives branded areas more presence in hand.
A crisp, high-density print process for designs that need vibrancy, quick curing, and reliable durability on coated packaging surfaces.
The everyday foundation for full-colour packaging artwork, especially when designs include images, gradients, or more layered creative work.
Chosen when brand identity needs tighter control. Ideal for signature colours that must stay recognisable across different runs and materials.
Useful for simple, confident branding where coverage and opacity matter more than highly detailed artwork or photographic effects.
A cleaner print route often paired with kraft boards and sustainability-led packaging briefs where materials and messaging need to feel aligned.
A restrained finish that softens reflection and supports a cleaner, more refined premium look while improving surface protection.
Used when colour needs more energy and the final carton should feel brighter, sharper, and more immediately visible in display settings.
A velvety finish that changes how the pack feels in hand. Best used where tactile quality helps support a more premium brand impression.
Adds focused gloss only where you want attention, usually on logos, names, patterns, or small design details that deserve a highlight.
A high-visibility enhancement used for logos, product names, borders, and presentation-led packs that need a stronger premium cue.
Builds depth into selected areas so the design does not just look better, it feels more considered in the customer’s hand.
Creates recessed detail for a quieter premium effect, especially useful on understated packs where elegance relies on restraint.
A practical add-on when the product itself helps sell the pack. Suitable for cartons that benefit from partial product reveal.
Good packaging decisions are not only about print. They affect shipping efficiency, shelf appeal, storage, handling, and repeat ordering. That is where practical support matters.
Share sizes, quantity targets, product type, and any branding direction you already have.
We match the brief with board grade, print route, finish level, and practical packaging format.
The key production details are checked before the job moves forward into the main run.
Your order moves through manufacturing, quality review, packing, and delivery scheduling.
Tell us your product, target look, and how you ship. We’ll recommend the right board, print, and finish for performance.
