A3 Cardboard Pad | 4mm Kraft Brown | 420 x 297 (mm) | 35pce Pack | The Box Man

The A3 Cardboard Pad (PAD-A3-K4) is a pre-cut corrugated pad in 4mm kraft brown sized to standard A3 paper dimensions. Slides straight into A3 mailers, envelopes, and flat boxes as a rigid backing board — protecting large prints, artwork, architectural drawings, and oversized documents from bending and creasing during transit. Buy A3 cardboard pads online in packs of 35 — Australian made with delivery Australia-wide.

Standard A3 Size, Ready to Use

No measuring, no cutting. Every pad in the pack is pre-cut to exact 420 x 297mm (A3) — consistent sizing with clean edges and square corners. Use as rigid inserts inside A3 mailers, protective layers between stacked items, or backing boards behind prints and photographs.

4mm Kraft Brown Corrugated Board

4mm thickness provides medium rigidity — a step up in stiffness for heavier items and applications where the pad needs to hold its shape under load. Available across multiple thicknesses to match your application.

At a Glance

• 420 x 297mm (A3) pre-cut — exact A3 dimensions, clean edges
• 4mm Kraft Brown — 4mm corrugated board
• Pack of 35 — bulk quantity for regular use
• Multi-purpose — mailer insert, backing board, layer separator, document protector
• Australian made — sustainably sourced paper, 100% recyclable
• Volume pricing — buy 4+ packs save 10%, 12+ packs save 15%, 20+ packs save 20%

Prices are GST inclusive.