Incredible Boxes - easy to fold and perfectly solid for shipping purposes.
This 220 x 160 x 16mm Superflat Mailing Box is made of quality kraft corrugated cardboard with more than 50% recycled fiber. You will not have to pay higher prices for superior quality. This Superflat A5 mailing box is one of our Signature Products. The super flat mailing box is designed to send your fragile items as a Large Letter with maximum protection. We refined the design over the years to make it perfect for high efficiency Pack and Send.
More than 70% of corrugated boxes are recycled and reused. In general, boxes and cartons have a much less environmental footprint than bubble padded mailers. Please choose the Right Box to Save Cost and Our Planet. Now we have 8 sizes of Superflat mailing boxes in Stock, ranging from 140mm ~ to 350mm (width).
Large letters
A large letter is an article which exceeds at least one of the small letter dimensions and has the following characteristics:
| Box Size |
220 x 160 x 16mm (Internal Dimension) |
|---|---|
| Brand |
Boxmore |
| Product Code |
B22 |
| Colour |
White Outside, Brown Inside |
| Box Style |
Diecut Folding, Self Locking. |
| Printing |
No printing Front and Back. |
| Feature |
Large Letter Size, Light Weight, High Quality Rigid Flat Mailer. |
| Sustainability |
Compostable, Recyclable |
| Product Type |
Mailer Box |
| Materials |
100% Recyclable as Paper |
| Finish |
Uncoated with a natural matte finish |
| Material Stock Weight |
|
| Item Weight | |
| Board Flute |
e-flute |
| Certification |
Certification: FSC Certified |
| Warranty |
backed with 90-Days eBPak Money Back Guarantee. |
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.

Sizing
Inside: 220 x 160 x 16mm (length x width x height)












Order 1,000+ mailing boxes, or Australian-made shipping cartons by the pallet, and we'll quote a wholesale price. Trade accounts get invoice terms and a dedicated contact.
Superflat boxes are about 16mm high inside, made for flat items: art prints, cards, photos, stickers, scarves, folded t-shirts, books and documents. They protect corners better than an envelope and stay thin and light to post.
All sizes are internal (length x width x height), measured inside the box. The outside is a few millimetres bigger because of the board thickness.
Fold the box into shape, slide your item in, then close the lid and tuck the front flap into the front of the box. For extra security, seal the front flap with a strip of tape or a branded sticker.
Most superflat sizes come in white, brown, black, light blue and rose pink. Use the "Same size, other colours" link above the description to see every colour in this size.
Yes. The boxes are delivered flat in packs and fold into shape in seconds, so they take up very little shelf space.
Yes. We make custom printed boxes from 1,000 units, usually in around 2 weeks. Get a quote. For smaller runs, a printed sticker or stamp on a plain box works well.
The pack size is how many boxes come in one pack, for example x100 is a pack of 100 boxes. "Number of packs" sets how many packs you get, so x100 with 2 packs is 200 boxes.
Yes to both. We offer 90-day returns on unopened items (see our refund policy), and you can choose pickup at checkout and collect from Minto NSW or Braeside VIC, Monday to Friday 9am to 4pm.
Order online and we'll usually have it ready in 15–30 minutes at either warehouse.
Talk to our team
Call us on (02) 8750 5347
Fast delivery Australia-wide
Via Australia Post and trusted couriers
Pickup in Sydney & Melbourne
Minto NSW and Braeside VIC
90-Day Returns
On unopened items