Description
A4 Superflat White Mailing Box
This A4 Superflat White Mailing Box, measuring 310 x 220 x 16mm, is constructed from quality kraft corrugated cardboard to ensure secure shipping. Its ultra-slim profile is specifically designed for efficient packing and qualifying as a Large Letter for postal savings.
- 310 x 220 x 16mm Internal Dimensions provide ample space for flat items while maintaining a low profile.
- Kraft Corrugated Cardboard construction offers robust protection for contents during transit.
- White Exterior Finish presents a clean, professional look for branding or direct shipping.
- Large Letter Size Compliance ensures eligibility for cost-effective postal rates, saving on shipping expenses.
- FSC Certified Materials highlight a commitment to sustainability, using responsibly sourced paper.
Compared to traditional bulky boxes, this Superflat mailing box is engineered for modern shipping needs, optimizing space and reducing carrier costs. Its design is a significant improvement over previous iterations, focusing on high efficiency for packing and sending, while also adhering to postal size restrictions for seamless delivery.
Key Technical Advantages: Advanced Efficiency and Protection
Engineered for superior performance, this mailing box features a die-cut folding, self-locking design that simplifies assembly and ensures a secure closure. The e-flute construction offers rigidity without adding unnecessary bulk, making it ideal for items requiring a high-quality rigid flat mailer. Its compostable and recyclable materials underscore a strong environmental commitment, allowing businesses to ship responsibly without compromising on quality or customer experience.
- Lay the flat box printed side down and fold up the side walls.
- Fold the side flaps in so the box holds its shape.
- Slide in your flat item: prints, cards, photos, a scarf or a folded tee.
- 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.
- Free delivery to Sydney & Melbourne metro on orders over $500.
- $50 flat rate to Wollongong areas and $75 to Gosford & Newcastle areas (up to 2 tonne).
- Australia-wide delivery via Australia Post and trusted couriers.
- Free pickup from Minto NSW or Braeside VIC, Mon–Fri 9am–4pm.
- 90-day returns on unopened items. See our refund policy.
Payment & Security
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
Sizing
What fits in this box
Inside: 310 x 220 x 16mm (length x width x height)
- A4 documents, folders and books lie flat
- Slim 16mm profile for flat items: prints, cards, photos, scarves and folded tees
- About 1.1 litres of space inside
- Delivered flat, folds into shape in seconds
- Sizes are inside measurements. Allow 5–10mm each side for tissue paper or bubble wrap.
- Not sure? Use the size finder below or call us on (02) 8750 5347.
More superflat mailing boxes
Not sure of the size? Enter your item's dimensions.
Packing essentials
Buying in bulk? Pay less per box.
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.
Questions about this box
What can I send in a superflat box?
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.
Is the size inside or outside the box?
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.
How do I close the box?
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.
Can I get this size in other colours?
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.
Are the boxes delivered flat?
Yes. The boxes are delivered flat in packs and fold into shape in seconds, so they take up very little shelf space.
Can I print my logo on the box?
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.
What does the pack size mean?
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.
Can I return the boxes, or pick up my order?
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.
Need it today? Pick it up.
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