Custom postal boxes
Self-locking postal boxes that fit through the post safely and open like a gift. The go-to box for online shops and subscription brands.
From £0.92 per box at volume · minimum 100 boxes
Kraft Classic Mailer · Customise in 3D →
8 designs in this style
Open any of them in the 3D studio and change the colours, size and logo.
What it is and who it is for
A postal box (also called a mailer box) is a one-piece corrugated box with a tuck-in lid and side flaps that lock without tape. It is strong enough to post on its own, so your customer opens your printed box, not a plain cardboard carton. Print the outside with your logo and the inside with a thank-you message, and the unboxing does your marketing for you.
- Online shops on Shopify, Etsy and Amazon
- Subscription boxes and monthly kits
- Candles, skincare, coffee and small gifts
- Influencer and PR packages
Standard sizes
Any size is possible. These are popular starting points; custom sizes are free from 500 boxes.
| Size | Inside dimensions (L × W × H) |
|---|---|
| Small | 15 × 10 × 5 cm |
| Medium | 23 × 15 × 7.5 cm |
| Large | 30.5 × 23 × 10 cm |
| Extra large | 35.5 × 25.5 × 12.5 cm |
Materials
- Kraft E-flute (1.5 mm, light and neat)
- White E-flute (1.5 mm, bright print)
- Kraft B-flute (3 mm, stronger for shipping)
- White B-flute (3 mm, stronger, bright print)
Print options
- Outside print: your logo and design on the outside of the box.
- Inside print: a message or pattern revealed when the box opens.
- One colour: the most affordable option, great on kraft.
- Full colour: photos, gradients and detailed artwork.
Finishes
- Matte lamination: Soft, modern look that hides fingerprints.
- Gloss lamination: Shiny finish that makes full-colour photos pop.
- Foil stamping: Gold, silver or rose-gold metallic logo or text.
- Spot UV: A raised glossy layer on just your logo or pattern.
- Embossing / debossing: Your logo pressed up or down into the board.
Prices
Indicative prices for a 23 × 15 × 7.5 cm box, printed outside, delivered with duties included. Your exact price depends on size, material and print, and is confirmed in your quote.
| Quantity | Price per box (from) | Order total (from) |
|---|---|---|
| 100 | £1.76–£2.24 | £176.00 |
| 250 | £1.44–£1.68 | £360.00 |
| 500 | £1.20–£1.44 | £600.00 |
| 1,000 | £1.04–£1.24 | £1,040.00 |
| 2,500 | £0.92–£1.12 | £2,300.00 |
Lead times
10–20 business days after sample approval, plus 5–10 days shipping. You approve a 3D mockup and a physical sample first, and we send photos of your boxes before they ship.
Popular with
- Packaging for candle brands
- Packaging for skincare and beauty brands
- Packaging for subscription box companies
Other box styles
Custom postal boxes FAQ
What is the minimum order for custom mailer boxes?
Our minimum is 100 boxes. Prices per box drop at 250, 500, 1,000 and 2,500 units.
Can you print inside the box?
Yes. Inside printing is popular for thank-you messages, social handles and patterns. It adds roughly a third to the box price.
Are your mailer boxes strong enough to ship on their own?
Yes. E-flute suits items up to about 2 kg (4–5 lb). For heavier or fragile items we recommend B-flute.
Do you charge for custom sizes?
Custom sizing is free from 500 units. Below that we use our standard sizes or quote a small die fee.
Are the boxes recyclable?
Yes. Corrugated board printed with water-based inks and no plastic lamination goes straight into kerbside recycling.
Ready to see your box?
Send your logo and sizes. You'll get a free 3D mockup and a delivered price within 24 hours.