Printing both sides of a mailer box is not automatically better.
For many e-commerce orders, outside printing is enough. Subscription boxes and product kits may benefit more from inside printing because the lid becomes part of the presentation. Some shipping projects work best with a plain exterior and branding only on the inside.
The right choice depends on what customers see, how the box travels and whether the extra print area has a useful job.
Before approving artwork, decide which surfaces actually need printing.
Outside, Inside or Both: Quick Comparison
| Project | Good Starting Point | Main Reason |
|---|---|---|
| Standard e-commerce order | Outside only | Branding visible during delivery |
| Apparel mailer | Outside only or simple inside | Usually does not need much internal information |
| Skincare set | Outside + inside lid | Inside can show product sequence or instructions |
| Subscription box | Both sides | Interior changes with campaigns or monthly themes |
| PR / launch kit | Both sides | Presentation matters throughout opening |
| Discreet shipping | Inside only | Plain exterior, branded reveal after opening |
This is only a starting point. Board color, artwork, courier labels and budget can change the final decision.
When Outside Printing Is Enough
Outside printing makes sense when the exterior already does everything the project needs.
Typical uses include:
- online apparel orders
- accessories
- simple subscription shipments
- lightweight skincare products
- branded direct-to-customer mailers
The exterior can carry the logo, pattern, product category or campaign artwork without adding another printing step inside.
Shipping conditions should also be considered.
The outer surface will pass through warehouses, sorting systems and courier handling. Shipping labels may cover part of the lid, while corners and printed surfaces can pick up marks during transport.
This means artwork placement matters.
Do not place the most important logo or message where a courier label is likely to sit. If the top panel is heavily designed, reserve a clear area for labels before the artwork is finalized.
Complex exterior artwork also needs to make sense for the shipping environment. A design that looks perfect in a mockup may behave differently after several handling stages.
When Inside Printing Is Worth Paying For
Inside printing becomes useful when the opened lid has something meaningful to communicate.
Good examples include:
- skincare usage order
- product instructions
- subscription theme artwork
- campaign graphics
- QR codes that lead to useful product information
- short brand messages
Skincare provides a simple example.
Suppose one mailer contains cleanser, serum and moisturizer. Instead of adding a separate instruction card, the inside lid can show:
1. Cleanse
2. Apply serum
3. Moisturize
That gives the printed surface a practical purpose.
Subscription packaging is another good use case. The exterior may stay consistent from month to month, while the inside artwork changes with each campaign.
What usually does not justify extra printing is repeating the same logo again simply because the surface is available.
If inside artwork adds no information, no visual reveal and no useful message, outside-only printing may be the better specification.
When Inside-Only Printing Makes Sense
Inside-only printing is often overlooked.
There are projects where the buyer wants the shipping exterior to remain simple.
Reasons may include:
- discreet delivery
- plain kraft appearance
- retailer or warehouse requirements
- heavy courier-label use
- reducing visible branding during transit
The box can stay plain outside while the inside lid carries the brand message.
This works especially well with natural kraft mailers where the exterior appearance is deliberately simple.
When the customer opens the box, the branding appears at the right moment instead of being exposed throughout the shipping journey.
For some brands, that contrast works better than covering both sides with print.
When Printing Both Sides Makes Sense
Two-sided printing is most useful when both surfaces have separate roles.
For example:
Outside: logo, shipping-facing artwork, campaign identity
Inside: product instructions, launch message, subscription theme
PR kits, subscription boxes and gift-oriented e-commerce packaging often fit this model.
The important point is that both sides should not simply duplicate each other.
If the outside already carries a large logo, repeating the same logo inside may add cost without adding much to the package.
Before approving two-sided printing, ask:
What does the inside need to do that the outside cannot?
If there is no clear answer, compare an outside-only quotation first.
White or Kraft Mailer: How the Board Changes the Print
The same artwork can look very different on white and kraft corrugated board.
White surfaces usually produce cleaner, brighter printed colors. This can be helpful for:
- lighter brand colors
- detailed graphics
- skincare artwork
- photographic designs
Kraft has a natural brown base.
Colors printed directly onto kraft may appear darker or more muted. Pale colors and subtle gradients usually need more attention during proofing.
This matters for inside printing too.
If the outside is white and the inside remains kraft, do not assume the same artwork can simply be copied onto both surfaces with the same visual result.
Artwork should be prepared for the actual substrate.
For projects where exact color appearance matters, review a printed sample rather than relying only on the screen proof.
How Much Extra Does Inside Printing Add?
There is no useful fixed percentage that applies to every project.
The additional cost depends on:
- artwork coverage
- number of colors
- printing method
- board construction
- box size
- order quantity
- whether both sides require separate production steps
The easiest way to make the decision is to request controlled alternatives.
Ask the supplier to quote:
Option A — Outside printing only
Option B — Inside printing only
Option C — Outside + inside printing
Keep the box size, material and quantity the same.
Now the price difference comes from the printing choice rather than several specification changes at once.
This makes it much easier to decide whether the inside artwork is worth keeping.
For broader cost-saving decisions, that topic belongs in the custom packaging cost reduction guide rather than being repeated here.
Confirm the Mailer Structure Before Final Artwork
Do not finalize the print layout before the mailer dieline is confirmed.
Mailer boxes include:
- lid panels
- front tuck sections
- side walls
- locking tabs
- crease lines
Artwork that looks correctly positioned on a rough layout can shift into a fold or disappear under a flap once the real structure is developed.
Box dimensions should also be settled first.
Changing the mailer size later can force the designer to reposition:
- logos
- patterns
- text
- inside-lid artwork
- QR codes
- label areas
The cleaner sequence is:
Mailer size → Dieline → Outside/inside printing decision → Artwork → Sample
For structural sizing, use the Custom Mailer Box Size Guide.
For line placement, bleed and artwork setup, use the Packaging Dieline Guide.
What to Send for a Mailer Printing Quote
To compare printing options properly, send:
- mailer size or approved dieline
- board type and color
- outside artwork
- inside artwork, if required
- expected order quantity
- shipping destination
- reference image if the design is still being developed
If you are unsure whether the inside is worth printing, ask for outside-only and two-sided versions using the same specification.
That gives you a real cost comparison instead of guessing.
FAQ
Is outside printing enough for a custom mailer box?
For many e-commerce projects, yes. Outside printing is often enough when the mailer mainly needs visible branding during delivery and the inside has no additional message or function.
Is inside printing worth the extra cost?
It can be when the inside lid carries useful instructions, campaign artwork, product sequencing or subscription information. If it only repeats the outside logo, the extra printing may not add much value.
Can mailer boxes be printed inside and outside?
Yes. Both sides can be printed depending on the board construction, artwork and production method. Confirm the dieline and material before final artwork.
Does kraft board affect printed colors?
Yes. Kraft changes how colors appear because the brown paper surface shows through the printed ink. White board usually gives cleaner color reproduction.
Choose the Print Area Before Adding More Artwork
Outside printing, inside printing and two-sided printing all have valid uses.
The better choice is the one that matches how the mailer will actually be shipped and opened.
Use the exterior for what customers and couriers see before opening. Use the inside when that surface has a useful role after the lid is lifted.
If both sides have a clear purpose, print both.
If not, keeping one side simple can reduce cost without weakening the packaging.
For a custom project, send the mailer size, board choice, artwork and quantity. We can compare outside-only, inside-only and two-sided printing before sampling.