310 x 220 x 16mm A4 Superflat White Mailing Box B21

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

• 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.

• 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.

• A4 Surface Profile: Broad 310 x 220mm footprint perfectly fits flat A4 merchandise, small prints, and thin tech items without creasing.

• Clean White Exterior: Crisp white finish delivers a clean, professional appearance that elevates unboxing and accepts address labels cleanly.

• Quick Assembly & Tape-Free Fold: Precise die-cut construction folds together quickly with integrated locking tabs for fast fulfillment line assembly.

Product Specifications

Ideal Applications

• Flat fragile items, enamel pins, jewelry cards, keychains, and small artisan crafts

• Art prints, greeting cards, certificates, photos, thin books, and A4 stationery

• Phone cases, screen protectors, memory cards, slim cables, and flat electronic parts