A4 Book Mailer Adjustable Height | 3mm Kraft Brown | 300L x 215W x 10-40H (mm) | The Box Man

The A4 Kraft Brown Adjustable Height Book Mailer (BM-A4-ADJ) is a multi-crease cardboard book shipping box that adjusts to four different heights — 10mm, 20mm, 30mm, or 40mm. One box handles paperbacks, hardcovers, thick catalogues, and everything in between. 3mm kraft brown corrugated board with sacrificial crush zones on both ends. Buy adjustable height a4 book mailers online — Australian made with delivery Australia-wide.

One Book Mailer, Four Heights

Pre-scored crease lines let you fold each mailer to the exact height your product needs. Posting a slim paperback? Fold to 10mm. Thick hardcover? Fold to 40mm. You keep one box size in stock instead of four — simpler inventory, less shelf space, faster packing.

Crush Zone Protection for Book Corners

The ends of each mailer extend beyond the contents, creating a built-in buffer zone. When a courier drops or stacks your parcel, the crush zone takes the impact — not your book’s spine or corners. Fewer damaged books, fewer returns, fewer unhappy customers.

At a Glance

• 300 x 215mm A4 footprint — fits standard A4 books and documents
• Adjustable 10–40mm height — fold to fit paperbacks through thick hardcovers
• Sacrificial crush zones — absorbs impact before it reaches your contents
• 3mm Kraft Brown corrugated board — rigid protection, lightweight postage
• Australian made — sustainably sourced paper, 100% recyclable

Prices are GST inclusive.