Super easy to use. Quickly delivery, very happy with my purchase.
Description
Maximize postage savings while safeguarding small, flat fragile goods with the Boxmore A4 Superflat White Mailing Box B21 (310 x 220 x 16mm). Engineered specifically with a ultra-slim profile under 20mm, this rigid corrugated die-cut box allows you to qualify for Australia Post Large Letter untracked and tracked envelope rates rather than costlier parcel tiers. Combining high crush resistance with a clean, professional white finish, it keeps flat items completely flat and protected against drops without bending during transport.
Key Features
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Australia Post Large Letter: Ultra-slim 16mm depth strictly stays under the Australia Post 20mm height threshold, slashing fulfillment and postage costs on small dispatches.
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Rigid Crush-Proof Armor: Strong die-cut corrugated board provides superior edge and face protection compared to standard paper envelopes, preventing flat goods from getting bent or crushed.
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A4 Surface Profile: Broad 310 x 220mm footprint perfectly fits flat A4 merchandise, small prints, and thin tech items without creasing.
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Clean White Exterior: Crisp white finish delivers a clean, professional appearance that elevates unboxing and accepts address labels cleanly.
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Quick Assembly & Tape-Free Fold: Precise die-cut construction folds together quickly with integrated locking tabs for fast fulfillment line assembly.
Product Specifications
| Feature | Details |
| Model / SKU | A4 Superflat Mailing Box B21 |
| Internal Dimensions (L x W x H) | 310mm x 220mm x 16mm |
| Height Specification | Under 20mm (Australia Post Large Letter Compliant) |
| Compatible Size | Fits Flat A4 Documents, Prints & Ultra-Thin Items |
| Box Style | Die-Cut Self-Locking Flat Mailer |
| Board Grade | High-Strength Micro-Flute Corrugated |
| Recyclability | 100% Kerbside Recyclable |
| Color & Finish | Bright White Exterior |
| Guarantee | 365-Day eBPak Guarantee |
Ideal Applications
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Flat fragile items, enamel pins, jewelry cards, keychains, and small artisan crafts
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Art prints, greeting cards, certificates, photos, thin books, and A4 stationery
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Phone cases, screen protectors, memory cards, slim cables, and flat electronic parts
Payment & Security
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Customer Reviews
Overall rating: 5.0 / 5 from 12 reviews.
I’ve used the A4 super flat mailing boxes for the last two years to post out my calendars. They’re a nice product both in terms of protecting the calendars in post, as well as neat presentation. Ive teamed them up with Polycell 300mm x 100m 10mm bubble wrap, a perfect fit on the calendars, and easily cut to length.
Good product, keeps everything safe
Great boxes!
perfect for my needs, met my expectations along with fast delivery and great cost
Great product, fast and friendly service!
Great products, great prices, fast delivery. Preferred packaging supplier!
Love this product.
Always easy to deal with. Good prices and fast shipping.
Exactly as described, great service, fast postage.
A4 super flat white mailing boxes These have saved on postage, they can get posted as a large letter instead of a parcel cost
A4 super flat white mailing boxes These have saved me a fortune in postage, fits my product beautifully and keeps it safe.