Yellow business envelopes in C5 and A4
Classic yellow business envelopes for invoices, contracts, catalogues and everyday office mail. eBPak stocks the two sizes businesses use most, C5 envelopes (160 x 230mm) and A4 envelopes (230 x 330mm), in 110gsm yellow paper, from packs of 100 up to cartons of 10,000. Need something tougher? Our 250gsm tough bags resist tearing and keep documents flatter.
Envelopes drawn to scale. Tap one to shop it.
Business envelope sizes
| Envelope | Size | Fits | Material | Pack sizes |
|---|---|---|---|---|
| Business #01 (C5) | 160 x 230mm | A5 flat, A4 folded once | Yellow 110gsm | 100 / 200 / 500 / 1,000 / 2,000 |
| Business #04 (A4) | 230 x 330mm | A4 flat, catalogues | Yellow 110gsm | 100 / 200 / 500 / 1,000 · 10,000 |
| Tough bag 02 | 215 x 280mm | Booklets, soft items | 250gsm card | 200 |
| Tough bag 04 | 240 x 340mm | A4 documents, soft goods | 250gsm card | 100 |
Paper sizes for reference: A5 = 148 x 210mm, A4 = 210 x 297mm. Leave a few millimetres of room so the flap closes flat.
Business envelope FAQs ▾
Business envelope FAQs
What size is a C5 envelope?
Our C5 business envelope (#01) is 160 x 230mm. It holds A5 sheets flat or an A4 sheet folded in half.
What size envelope fits A4 paper without folding?
The #04 business envelope (230 x 330mm) holds A4 flat. For a stiffer A4 envelope, see our 300gsm card envelopes.
What is a tough bag?
A tough bag is an envelope made from heavier card (250gsm here) instead of standard paper, so it resists tearing and bending better.
Do you sell business envelopes in bulk?
Yes. The C5 comes in packs up to 2,000, and the A4 yellow envelope is available as a 10,000 wholesale carton.
Will my envelope post as a letter?
That depends on the final size, thickness and weight. Check Australia Post’s current letter limits before you post.
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