Description
180 x 100 x 16mm Mint Blue Superflat Letter Gauge Mailer B348 is a mailing and shipping package for structured protection and professional order fulfilment. Review the specifications and available variants below to confirm the required format, size and ordering quantity before purchase.
Key Features
Clearly identified format: The product title and listed variant provide the main purchasing reference, helping reduce ambiguity when replenishing packaging or consumables.
Paper-stream option: The source description identifies recyclable or recycled-content construction; dispose of it in line with local collection requirements.
Compostable construction: The original listing identifies compostable construction; follow the relevant local collection or composting requirements after use.
FSC-certified board: The original specification identifies FSC certification for the board used in this product.
Efficient assembly: The die-cut, tuck-front or self-locking format is designed for straightforward assembly and a tidy finished pack.
Product Specifications
| Size / dimensions | 180 x 100 x 16mm; 100 x 180 x 16mm |
| Colour | Blue |
| Material | Recycled kraft cardboard |
| Product reference | B348 |
| Available options | Mint Blue / 180 x 100 x 16mm / B348 x100 |
| SKU reference | B348-100 |
| Product type | Mailing box / carton |
Ideal Applications
- E-commerce order fulfilment
- Retail and subscription-box packing
- Postal, courier and warehouse dispatch
- 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: 180 x 100 x 16mm (length x width x height)
- Slim 16mm profile for flat items: prints, cards, photos, scarves and folded tees
- About 0.3 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.