
Custom Mailer Boxes
Full-colour printed mailer boxes with inside and outside print. The packaging your customers actually see — designed to create unboxing moments that drive retention and shares.

The unboxing moment starts here
Create a great unboxing experience
Built to protect. Designed to impress
Crashlock Base
Snaps into shape the moment you open it. Up to 60% quicker to assemble than a standard mailer box.
Peel & Seal / Tear Strip
Seals in seconds on the fulfilment line. Opens cleanly on the doorstep. No extra steps at either end.
Custom Inserts
Shaped to hold your product exactly where it should be. No void fill, nothing that looks like an afterthought.
Inside & Outside Print
CMYK or Pantone. Outside handles the subtle doorstep moment. Inside is where the brand story lands.
E-Flute or B-Flute Board
E-flute as standards or a sturdier B-flute for product that needs more protection in transit.
Colour Matched Print
Exact colour matching to your brand colours. Consistent for each production. Pantone or unique.

Built to your exact requirements
Every custom mailer boxes is engineered from scratch for your product, brand identity, and customer experience.
Technical Specifications
Common questions about custom mailer boxes
Everything you need to know before ordering custom custom mailer boxes.
What's the difference between a mailer box and a shipping box?
A mailer box is what your customer sees — it's designed for the unboxing experience with tuck-in flaps, self-locking tabs, and full-colour print inside and out. A shipping box (0201) is the outer transit packaging designed primarily for protection. Many ecommerce brands use a mailer box as the primary packaging, or a mailer box inside a plain shipping box for extra protection on fragile products.
Can I print on both the inside and outside?
Yes — this is one of the key advantages of custom mailer boxes. Outside print handles brand recognition on the doorstep. Inside print creates the surprise and delight moment when the box is opened. We recommend using the inside for your brand story, social media handles, QR codes, or a thank-you message. The inside print is where the emotional connection happens.
What's the minimum order for custom mailer boxes?
From 500 units with digital printing. This makes custom mailer boxes accessible even for smaller brands or product launches. At higher volumes (2,000+) we can switch to litho-laminated production which reduces the unit cost significantly. We always price both options so you can choose based on your budget and volumes.
Do I need to use tape with a mailer box?
Not necessarily. Our mailer boxes have many features but our peel and seal feature means you can secure the box without the addition of extra tape on your packing lines.
How much do custom mailer boxes cost?
A small large letter size box with digital print on the inside and outside of the box typically starts from around £1.50–3.50 per unit at 250 quantity, depending on size and finishes. At 2,000+ units the cost drops noticeably, and at 5,000+ with either Flexo or litho printing options, it reduces further. We provide fully transparent quotes with line-by-line breakdowns covering print, material, finishing, and delivery.
Explore more packaging products

Custom Cartonboard Boxes
Retail-Ready Folding Cartons

Printed Shipping Boxes
Flexo & Digital Options

Custom Printed Rigid Boxes
For Premium unboxing experiences - Rigid boxes built for brands that take presentation seriously.
Packaging insights & guides

Built To Order: When Does Custom Packaging Make Sense?
As your brand grows you’ll be faced with a decision on how custom you go with packaging. We’ll talk you through it.

Setup For Success: Tooling Costs In Packaging
Our guide to setup costs in custom packaging: why they are necessary, cost ranges and alternatives.

Sticker Shock: Why Are Your Packaging Costs Going Up?
We'll break down why packaging costs are rising and what you can do about it
Ready to create premium custom mailer boxes?
Tell us about your project. We'll come back with a transparent quote, timeline, and sample plan within 48 hours.