Inside vs Outside Printing on Mailer Boxes: Where Should You Spend Your Print Budget?
Quick answer: Spend on the surface that is seen at the moment that matters most to your brand. The outside is seen by the courier, the doorstep and anyone who handles the parcel, and it takes the knocks. The inside is seen only by your customer, at the moment they open it, and it arrives clean. For most ecommerce brands where the unboxing matters, a simple outside plus a printed inside lid gives the most for the money. For brands whose box is mainly a transit layer, outside only is enough. Adding inside printing to mailer boxes means a second printed side, so it usually costs more; get a quote both ways before deciding.
Who sees each surface, and when
| Surface | Who sees it | When | Condition on arrival |
|---|---|---|---|
| Outside lid | Courier, neighbours, the customer at the door | Before opening | Often covered by a label; can be scuffed |
| Outside sides and front | The same people, plus anyone stacking parcels | Before opening | Rubbed and knocked in transit |
| Inside lid | The customer | The first thing they see on opening | Clean, protected by the closed box |
| Inside base and flaps | The customer | As they lift the product out | Clean |
That table is the whole decision in small. The outside works as identification and first impression. The inside works as the reveal. Which one earns the budget depends on which of those your brand needs more.
Why printing inside costs more
The inside of a mailer is the reverse of the same printed sheet. Printing it means a second printed side, which on many presses means a second pass, with its own setup. That is why inside printing is usually priced as an extra rather than included, and why printing both sides costs more than either side alone.
How much more depends on the print method, the quantity, how much of each side is covered and how many colours are used. No single percentage holds across suppliers, so ask for the options side by side on one quote:
- outside only
- inside only
- inside and outside
Keep the quantity and board the same across all three, so the difference you see is the print alone. Coverage and colour count are budget levers too. A logo in one colour on the outside with a full-colour inside lid can cost less than full-colour print on both sides.
The label covers the lid
Most brands put their best artwork on the outside lid. It is also where the shipping label usually goes. Royal Mail’s online postage can be printed as a 6 x 4 inch label, about 152 x 102 mm, and on a small mailer that covers a large part of the lid.
Plan for it:
- Leave a clear, plain area on the lid where the label goes, away from the logo.
- Or put the logo on the front panel or sides, and keep the lid simple.
- If your warehouse adds a pick label or a returns label too, allow for both.
This is one reason a busy, full-colour outside lid often gives less return than the same money spent inside.
Outside print takes the knocks
The outside travels through sorting, vans and doorsteps. Corners rub, sides scrape against other parcels, and dark solid colours show every mark. The inside stays protected until the customer opens the box.
If the outside matters to you, keep it robust. Lighter colours and patterned designs hide wear better than a single dark flood colour. A protective finish can help: anti-scratch film helps reduce visible scratches and scuffs, although no finish stops damage in transit. Our guide to packaging print finishes explains the options.
When a plain outside is the better choice
A branded outside tells everyone what is in the parcel. For some products that is a reason to keep it plain:
- Valuable goods. A well-known logo on the doorstep can draw attention to what is inside. Porch piracy, parcels stolen after delivery, is a real risk for high-value items.
- Private products. Health, intimate and personal items are often better in a discreet outer.
- Mailers shipped inside an outer carton. If a fulfilment partner or a marketplace puts your mailer in its own box, the outside works more like a retail face than a doorstep one.
For these, inside only is a strong option: a plain or lightly marked box outside, and the full brand inside.
The inside face of the board
Many boards used for printed mailers have a white printable face on the outside and plain kraft on the reverse. The inside of the box is that reverse. Because ink sits on a brown base there, colours come out muted, pale tones most of all, so an inside print on kraft looks softer and darker than the same artwork outside.
If you want bright colours inside, you may need a board that is white on both sides, and that changes the board as well as the print. If your inside design is a single dark colour or a simple pattern, kraft can look deliberate and natural. Pantone references and CMYK values can be used to manage colour consistency, subject to normal variation caused by the chosen board, ink, coating and production method. The wider trade-off between the two surfaces is covered in our guide to kraft vs white boxes.
What you print inside is fixed for the run
Anything printed inside the box stays there for every box in the run. That matters for:
- discount codes and offers with an end date
- QR codes that point to a campaign page
- seasonal messages
- social handles or web addresses that may change
Keep the inside print to messages that will stay true for as long as the boxes last: the brand, a thank-you, how to use or care for the product. Put anything that changes on a printed insert card, which you can reprint cheaply between runs. Our post on unboxing on a small business budget covers cards, tissue and stickers.
Artwork for the inside is mirrored
Because the inside is the reverse of the sheet, the inside artwork is laid out as a mirror of the outside. A panel that sits on the left outside sits on the right inside, and the lid artwork has to read the right way up when the box is opened, not when it is closed.
Ask for both dielines, outside and inside, and check the 3D mock-up of the open box before approving. For bleed, safe zones and file set-up, see our guides to print-ready packaging artwork and what a dieline is.
Decision table
| Your situation | Where to spend first |
|---|---|
| Unboxing is part of the product, gifting or social sharing | Inside lid, with a simple outside |
| Box is mainly a transit layer | Outside logo, keep it simple |
| High-value or private products | Inside only, plain outside |
| Mailer ships inside an outer carton | Outside, as a retail face |
| Tight budget, first order | One-colour outside logo, or inside lid only |
| Messages change often | Plain or simple inside, with a printed insert card |
| Several box sizes | One outside design across sizes; inside print where it matters most |
For subscription boxes specifically, where the interior drives retention, see our guide to subscription box packaging. If you are still deciding which box layer you need, start with mailer box vs shipping box vs product box.
Inside and outside printing with us
We print custom mailer boxes on the outside, the inside, or both. Offset, digital and screen printing are selected to suit the specification and quantity. Tell us where the box will be seen, where the label goes, and what the inside should say, and we will quote the options side by side.
- Orders start from 100 units.
- Design support is free.
- A digital 3D mock-up is free.
Printing questions for mailer boxes
Is it worth printing the inside of a mailer box?
If the unboxing matters to your brand, usually yes: the inside is the one surface only your customer sees, and it arrives clean. If the box is mainly a transit layer, the money often does more elsewhere.
Does inside printing cost more than outside printing?
Usually. The inside is a second printed side, which often means a second pass through the press. The difference depends on the method, quantity, coverage and colours, so compare quotes for each option at the same quantity.
Should I print inside only?
It suits valuable or private products, where a plain outside draws less attention, and brands that want the reveal without paying for two sides.
Why does my inside print look darker than the outside?
The inside is often the kraft reverse of the board, and kraft mutes colour. A board that is white on both sides gives brighter inside colours.
Where should the shipping label go on a printed mailer?
Usually on the lid. Leave a plain area for a 6 x 4 inch label, or place the logo where the label will not cover it.
Can I print a discount code inside the box?
You can, but it stays on every box in the run. For codes and offers that expire, a printed insert card is easier to change.
Want to compare outside, inside and both on one quote? Send us the box size, quantity and a rough idea of the artwork for each side.