C4 Envelope (Envelope)

Why Every Modern Office Needs C4 Envelopes in 2026

In today’s professional world, first impressions matter—especially when sending important documents. Whether it’s a contract, proposal, or official letter, the way you present it reflects your brand. Choosing the right envelope size is essential, as it ensures document safety and enhances your professional image. That's why C4 boxes are so important for sending things around the office these days.

The C4 envelope size is 229 × 324 mm (9.1 × 12.8 inches), designed to hold A4 documents without folding. These sizes make sure that your papers stay flat, clean, and undamaged while they're being shipped. Most government agencies prefer C4 envelope sizes, which makes them one of the best options for companies.

At Tagsen, we specialize in high-quality custom C4 envelopes crafted from premium 100 GSM Alabaster paper. Our envelopes are made to meet professional standards. They have a smooth finish, sharp edges, and a strong sticky seal that makes sure they are always safe to mail.

Many different types of businesses use these boxes. Businesses depend on them for proposals and bills, schools use them for awards, and banks and law firms trust them with private papers. Because they can be used in many ways, they are an important business supply.

In 2026, more and more businesses are picking custom-printed C4 envelopes to make their brands stand out. Envelopes are now more than just packaging. They show who you are with logos, brand colors, and simple patterns. They are also a safe choice because there are options for paper that is good for the environment.

C4 envelopes are the best way to send papers in a way that looks professional, is reliable, and makes an impression.