Brown superflat mailing boxes
Brown superflat mailing boxes are slim kraft mailers with 16mm of internal depth, made for flat items that must not bend: cards, prints, certificates, vouchers and thin accessories. They fold together without tape. Choose 180 x 100mm, 220 x 160mm or A4 310 x 220mm.
Brown superflat boxes drawn to scale (length x width). Click a box to shop.
Brown superflat sizes
| Box size (mm) | Code | Good for | Pack |
|---|---|---|---|
| 180 x 100 x 16 | B295 | Cards, vouchers, small prints | see product |
| 220 x 160 x 16 | B296 | A5 prints, cards, flat accessories | 100 |
| 310 x 220 x 16 (A4) | B297 | A4 documents, prints, calendars | 100 |
Sizes are internal dimensions. Going by post as a large letter? Check Australia Post’s current letter size and weight limits against the outside of the packed box.
Brown superflat box FAQs ▾
Brown superflat box FAQs
How deep is a superflat box?
About 16mm of internal depth, enough for cards, prints and thin accessories.
Can I post a superflat box as a large letter?
Often, yes. Measure the outside of your packed box and weigh it, then check the current Australia Post letter limits before you post.
Which superflat box fits A4?
The 310 x 220 x 16mm superflat box (B297) fits A4 documents and prints.
Do you have white superflat boxes?
Yes. See our superflat letter boxes in white and colours.
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